They're allowed to be assholes, I can be a raging removed when I need to. I sincerely doubt the goal of anyone there is 'convincing them to hate the trans identity' and if a person they interact with is at the point of hating all trans people because someone was rude to them online that sounds like they already did, and were looking for an excuse.
I just highlighted it because if someone's going to say bigoted things because they got 'baited', that reflects poorly on them, and them alone. If they are incapable of taking criticism from minorities they interact with, that's a fault on their part, not the minorities for not being 'nice' enough.