I think the reason why people argued against you (other than the fact that the point of posting something like what you posted is pretty much to start a debate) is that you had a very opinionated statement and you referred to the logic used to indicate that gay people are born gay as "sick" (despite the fact that it has been scientifically proven and that, even if homosexuality is something that occurs because of a series of events over one's childhood, it's not the person's own doing).
You also said that it was "1000 times worse for a black person" (that's the past, and doesn't really apply to this debate), stated that you intentionally disrupted the protest (I don't agree with the protest methods but you're basically saying that you don't care about the people who are the victims of these hate crimes), brought religion into the discussion ("Being black isn't a sin") when you neither explained what that had to do with the protest (Not all sins are illegal, this isn't Vatican City) or why it even mattered that it was a sin (though in my studies I have only gathered that homosexuality was a crime in ancient Christian settings, not a sin), and stated that you felt you need to tell gay people that "what they are doing is wrong" (when, frankly, they have probably heard enough of that in their lifetime and don't need to hear it from you).
So if you were still wondering why no one left it alone, that's why. However, relating back to the protest, you never really gave a legitimate reason for disrupting the silence.