Trap is a slur, especially used often by weebs. Describing gender non-conforming characters who look feminine as “traps”, including many canonically non-binary characters, is pretty fucked up when you think about it. To them, “traps” and genderqueer people in general are sex objects, not characters with respectable identities. Most of the weebs that throw that word around are also the ones to do trans erasure, like denying that a character is transgender or otherwise gender non-conforming, instead treating any character implied not to be AFAB as a man; and then often ironically going crazy defending it as “not gay” because that’d be bad – there’s a reason “traps aren’t gay” is a meme, and it’s an unironically defended position by these people. They convince themselves it’s not gay by reducing queer people & characters down to sex objects, things to masturbate to, rather than people. If you don’t see them as a person, it’s not gay or immoral, is how they process it. Obviously they won’t say that explicitly if you ask them though.

Now, I’m not saying everyone who’s ever used the word “trap” is a bigot or anything. People use words without realizing the way others see it, and the impact it has. I used it in my weeb phase. But undeniably, “trap” is a slur used to objectify queer people, and it always has been – it originated in 4channers & internet weirdos getting mad over trans people being at gaming events, posting pictures and labelling them “traps” (“they’re trying to trick you into thinking they’re a woman to have sex with them, when they’re really not a woman”). It’s no different than other slurs for queer people (like “fag”). It’s harmful and shouldn’t be used.