Someone who I watch occasionally on YouTube pointed out that when someone’s channel is focused on a particular subject, you only see the side of them which relates to that particular subject. Likewise if someone is an activist dedicated to a specific cause, or you only see someone in a specific environment or forum dedicated to a particular thing, if you don’t know them personally, you’re not going to see much else. And for someone who doesn’t want talking about same-sex relationships to be normalized, even someone talking about the (non-sexual) stuff they do with their same-sex partner can stand out too much in their minds in a way they personally find unpleasant. There’s probably a name for a fallacy and/or bias involved here, but I can’t think of one offhand.
There do exist a tiny number of gay people who are “obnoxiously gay” even to other LGBTQIA+ people, and in almost every place you might see them. But are they really any worse than The Straights™? You know, those obnoxiously breederific cishets who most straight people are embarrassed to be seen with when they get like that.