Maybe the gay men in this thread are all manly beer drinking, burping, farting, ball throwing He-Men, but not all gay men are and to treat them like they are some misled, uneducated and wrong person just seems harmful and hurtful.
Just to keep on topic with the whole Knight in Shining Armour thing, I want to tie what you said about not all men not living up to this conventional ideal of socially constructed masculinity.
I would personally like to see a gay male companion who doesn't actually ooze machismo nor isn't the cultured man of class like Dorian was. I don't see anything wrong with having men in stories who are rather soft-spoken, slight of stature, unable to grow beards or bulk up on muscle (and aren't elves). I get the impression from other gay men in real life that they need to have something to prove their masculinity and be able to keep in line with their heterosexual counterparts. All this because of this imposed mentality of "liking other men sexually = feminine" then viewing it as a bad thing, which in turn is some kind of subconscious misogyny there. I get that- "oh well, I'm sexually attracted to men, I've just used up all my 'I'm just like a woman' points, gotta cancel them out by butching it up, am I right?". When that shouldn't be the case.
So yeah, maybe for me, I'd like to see a rather unseasoned knight in training who "has his heart in the right place", but there are other traits about him that aren't so... gallant, like your classic knight in shining armour. Like, well, he never really learnt how to swing a sword, but only managed because he had to. He was never the type to defend himself because everyone else did that for him, but take them away, he's like "oh ****, whut?". He's rather under-developed because genetics cursed him to be rather slight. Oh well.
But what I'm getting at is that I'd like to see this kind of character who so happens to be gay, but written in a way humanises those characteristics rather than making them into a joke. I mean, you see it all the time in the quintessential "hero's journey" storylines where you have a youth who's near completely hopeless go through the wringer and come out stronger for it- why couldn't it be the same for this kind of character, who only just so happens to be homosexual.