Here's something I'm still conflicted about: finding a statement that is basically feminist, basically accepting, but has some flaws, and tearing it to fucking shreds. It's the old problem of "homophobia is retarded"; do you say "hell yes, thank you for accepting gay people," or do you say "do you have some kind of fucking problem with mental disabilities or have you just never considered you're insulting real people there?" The second is more fair, more correct. But it also runs the risk of making someone who's just starting to come around to your side decide that your side is a bunch of unpleasable Language Police who derive more joy from proving others wrong than from actually doing anything right.
I'm honestly torn on "homophobia is retarded." I have the feeling that I "should" come out against it, but I think it depends on context. If the person saying it is pretty new to the idea of not being homophobic, and if they're using "retarded" thoughtlessly and without intended malice, I'd really let it slide, or be very gentle in correcting them. I'd rather have an imperfect ally. On the other hand, if someone is an established ally and is just throwing words around, then it is the time to call them out on "hey, that language really isn't okay."
And then again, I'm sorry, but there really are people who are do spend all their time eating their own, who never found a statement so open-minded that they couldn't call it "TOTAL FUCKING BULLSHIT" for not being open-minded enough. There's an example here. I like the comic. I think it's sweet and funny and so gay. It's envisioning a better world. And then in the comments underneath it gets ripped apart as "shitty and cissexist" with "so many fucking problems."
I don't prioritize gay rights over trans rights. But I prioritize rights movements over the endless internal criticism of those movements. Sometimes that criticism is right and necessary (as when feminist movements veer toward being Rich White Straight Ladies' Liberation), but it should never eat the movement. Progress should not be abandoned in favor of perfection. SMBC is a comic with a wide audience and probably quite a few of them do say "that's so gay." Getting them to think about that literally is a really good thing. If it could be done in a way that included some more permutations of "gay," I guess that would be better, but this isn't bad.
If someone is 98% on your side, you know what? Cut them some slack. Otherwise you might have to actually deal with the people who aren't on your side at all. They're a whole lot meaner.