Putting your character in a trans pride shirt in a comic is unbelievably stupid. You should be able to explain and inform to your audience key character attributes like 'they're trans' without slapping a shirt on announcing to the world "I'M TRANS!!!" - and if she were trying to be clever by having him wear that before he wakes up in a woman's body, then it should have been something subtle, like a clothing ensemble that happened to fit the right colors, because a cis person wearing a trans flag doesn't even make any sense in a SJW world. And if he is trans to start with, ignoring the problems she'd then have to tackle by putting their FTM back into a female body (being generous and assuming a clearly male character isn't supposed to be MTF), why would he be in his own house constantly reminding himself he's not in the body he wants to be/had to undergo treatments for a mental illness?
the tl;dr I'm getting at here is that while it's obnoxious to slap those on your fanart/illustrations, it's even worse to do it in a comic, where you have more than one frame to inform the audience of your character's traits. (And by the way, in his little photo with his black husband there, you can see he's STILL wearing that shirt. Apparently he only owns transflag shirts.)