To be fair a lot of people use the tag for stories that generally bring up queer issues, or has a majority queer cast. (I think that's what it was meant for too, but don't quote me on that.) I use that tag myself for the former, even though they're not a major part of my comic they're still there.
This doesn't apply to everyone, but I've seen this being the consensus with some. Not so much as them treating it like a ship, but hounding the creator to make it a canon thing in the story, I myself have had people in the past spam my comments with chants for my characters to kiss or get together. It can be really frustrating when you're trying to tell a serious story, and while I'm not scared to develop my MC's friendship overtime, I know reader's push for romance is a real fear for some. I remember a while back I followed a webcomic creator who was developing a slice-of-life/drama about two guys in a really close friendship (Like a familial type of thing.), the characters were meant to have no romantic or sexual interest in eachother, but readers hounded the creator so bad they quit the comic. I guess it got to a point where people were calling them homophobic for not complying with the demands to make the ship canon, which I did see some comments like that pop up occasionally, who knows how bad it was in their DMs and on social media. It was really sad, and I haven't seen them post anything online since.
It's nice that it never got that bad with my comic, but I think their audience skewed younger than mine, so they got a lot of horny, bratty kids. Plus this was before I started my comic, when BL was way more popular than it is now.