I have no skin in the game, lemmy.ml is federated with both blahaj.zone and hexbear, plus I'm cis. However, I do think it's worth looking at the situation as a whole:
A member of blahaj.zone is insinuating that the majority of self-proclaimed trans individuals on Hexbear are cis troll accounts attempting to be hostile and confrontational.
Personally, I am in the camp that thinks that this is at best ignorant, as there's no proof I've seen of this, and at worst transphobic. Again, it's worth noting though that I myself am cis and as such I will not pretend to speak for the experience of trans people.
Overall, I do think it's reasonable to ask people not to assume someone claiming to be trans isn't trans merely on the grounds that they are unpleasant to interact with or even actively confrontational. The mere fact that they are acting confrontational should be enough to disengage, but their identity shouldn't be also called into question.