As a refresher for the dialogue:
Roman: PFFFFT!! Janus? Hahahaha! What are you, a middle school librarian? Hahahaha. It's a stupid name.
Janus: Oh, Roman, thank god you don't have a mustache. Otherwise, between you and Remus, I wouldn't know who the evil twin is.
So many people are all like 'oh Janus is so horrible telling Roman that if he had a mustache he wouldn't be able to tell the difference between him and Remus' but HONESTLY!
It was true!
Names are an important, powerful thing, and when Janus revealed his badass name to show he wanted to be part of their team, Roman didn't *just* LAUGH, he said "PFFFFT!! Janus? Hahahaha! What are you, a middle school librarian? Hahahaha. It's a stupid name."
That's a horrible thing to say! He did sound like the evil twin!
Everyone's like 'oh but when Janus said "Oh, Roman, thank god you don't have a mustache. Otherwise, between you and Remus, I wouldn't know who the evil twin is" he was attacking Roman's worst fear' AS IF NOT BEING ACCEPTED AND BEING LAUGHED AT ISN'T A FEAR OF JANUS'S!!
Virgil presented himself as a bad guy so Thomas would listen to him, so they'd taken him seriously, and Janus has proven that he wants what's best for Thomas like everyone else.
So how come he can't have done the same thing? Why is that so hard for people to consider? He has feelings too!
I'm not saying Janus was in the right, I'm saying he was provoked and shouldn't be made out to be the villain when they were both in the wrong (also rip Janus because his name was the only one to be laughed at, Roman didn't laugh at Virgil's name he laughed at Patton saying his name should be Virgin and Thomas immediately stood up for Virgil)
Anyway I still love Roman and Janus and that entire encounter went wrong in every possible way thanks for coming to my ted talk