the only two areas where men face issues which could even be considered as sexist are parental custody lawsuits & female-on-male or man-on-man rape cases
Correction: the only two areas you are aware of that men face that could be considered sexist are those two topics. Making such a broad, absolute statement as you just made is overreaching. Even if you were an expert on the topic of men's issues and studied and discussed it for years, there could well be issues some men face that would be outside of your knowledge. And discounting the validity of every other possible issue other than the ones you listed without so much as mentioning why you discount them does nothing to advance the discussion and merely unfairly trivializes men's issues.
and in both cases, the perceived sexism is a result of the society that men have built for themselves, a double edged sword
this 'sexism' is simply the patriarchy working in a way that does not suit men
Are you somehow suggesting that every single male in existence is part of some vast conspiracy to keep men in power at the expense of women? I guess I didn't get that memo. I certainly didn't "build" anything that is designed to treat people unfairly. Or are you saying that attitudes that have been around for thousands of years, since hunter-gatherer societies, attitudes that I myself argue against, are something that we are responsible for? That anything that happens as a result is our just rewards since we happened to be born male? Because that's even more absurd. And if you are saying we're responsible for perpetuating them, even if that is the case, it doesn't excuse the injustice being done.
for centuries, possibly even millennia, men have deemed that women are only fit for the kitchen and raising kids
I'm not deeming that. Why are you holding me and others who take issue with the unfair treatment of men responsible for the attitudes of "society" any more than you hold yourself responsible? We're (or at least the people in the men's rights movement that I agree with) just trying to get fair treatment.
and now, in modern times, this is working against them in parental custody lawsuits - more or less the only area in law which is not heavily favoured towards men
because women have for so long been typecast as the only being fit for raising kids, naturally there is going to be a bias towards them, the loving mother who gave up her life to raise the father's child
I'm not sure what point you're making. That we "had it coming" because of attitudes that were around before any of us were even alive? I'm sorry, but that's outrageous.
and for rape
well
blame the patriarchy again
I think I'll blame the rapists and not the vast male conspiracy to take and maintain power that doesn't exist.
female-on-male rape cases are treated as a joke because, thanks to age old thinking that man > women, a woman cannot be superior to a man
she cannot be physically stronger
as emotionally empty as a male rapist
it cannot be possible for a woman to take advantage of a man the same way that men have since the dawn of civilisation
The idea you are describing is not "the patriarchy," it is "masculinity." There is an attitude inherent in society that men must be and act "manly." This is a destructive attitude and should be argued against. There is also the (absolutely ridiculous) idea that men cannot withhold consent because "men always enjoy sex." This is downright stupid and should be labeled as such.
These attitudes perpetuate because we act in such a way that they continue to exist and be passed on to our children, not because there is a contract between all men to keep them going to "keep the women down." We fight them by treating people fairly and fighting injustice that results from treating people unfairly. This
includes unfairness against men, against women, against blacks, whites, hispanics, gays, straights; anyone who is being treated unfairly based on some aspect of them that really has no bearing on the matter at hand.
And even if you believe that men, or whoever, are perpetuating these attitudes and that it's their own fault, that does not justify unfair treatment. A victim is a victim, a crime is a crime, and bad things are bad. We cannot stand by and watch with disinterest when someone experiences injustice, even if that person may have played a minor role in causing it. We would not excuse the con-artist for conning a greedy person: regardless of the victim's role in the crime, the perpetrator is still doing something immoral.
tl;dr - sexism against men is not an issue
Your argument as to why sexism is not an issue boils down to "only a few issues are valid" with no reason why all of the rest are invalid, and "men had the rest coming." There are plenty of legitimate problems men face in today's society (for instance, unfair bias in the legal system, including
but not limited to parental custody issues). If there are some issues that men's rights advocates argue about that you think are non-issues, I can address these (men's rights advocacy is very disorganized and many people have conflicting beliefs, so it's quite possible that some issues you might be thinking of are things I also consider non-issues). As for "men had it coming," however you feel about the idea of "blaming the victim," I don't think it "excuses the perpetrator."