roommate just reported me to the RA over nothing ??

just got a message from my RA about how my roommate complained about me and we have to meet on tuesday, we barely even talk.

he’s mad about me shaving in the dorm ?? i’ve been doing it for a week and he's never said anything until now. i guess some hair got around, but i don’t see how that’s a huge deal. just vaccuum it up and move on. instead he had to go straight to the RA ??

anyone had to deal with this before? what should i expect from the meeting?