I addressed this with point number 2 (There is no evidence in the series). The response being: So?
What I mean is, whether it will happen in the anime we all watch is irrelevant. In all likelyhood, no pairing will ever happen between Ash and another person, simply because it is a kids show and establishing a canon pairing would piss off a lot of viewers. This doesn't stop people from liking Pokeshipping, Pearlshipping, or any other one.
So if your argument is 'it won't happen in the anime, therefore it is a bad pairing' than by default, all pairings are bad.
But even if we ignore all that, refer to our last exchange over Rayshipping. As I had said, these pairings can also be thought of in a hypothetical (meaning we think of the world itself and ignore that there are writers and viewers) or fanfictional sense. In either case, there is nothing to discredit the possibility of this happening, or to suggest that it would be a bad thing if it did.
With all of this in mind, if you would still like to try and 'crush homosexual shippings', feel free to have at it. You've already demonstrated sexism during the Rayshipping exchange, so why not add homophobia to the list :P