They/Them is named after the gender pronouns of the main character of the group, a transgender teen named Jordan. That's about as deep of insight you'll get on the innerworkings of real trans people - the rest is shameless copy-and-paste dialogue that you have seen in countless other pictures. Abominable horror cliches (and there are many present) are tolerable and even welcome to some, but caricatures of gay American teens in such a seemingly progressive premise can't be seen as anything other than exploitative.
If representation (i.e. the presence of gay people) is enough for viewers, then consider this movie a success. If you want any sense of the thoughts, emotion, problems, solutions, or a shred of applicable context on the struggles of gay youths, this contrived mess will not satisfy.
Rating: 3/10
★★★☆☆☆☆☆☆☆