I've felt a small, but vocal, minority of SEGA fans are being real assholes towards the Relic and Creative Assembly titles. Haven't seen too much of fans attacking fans, but I take a rude comment directed at a game as sort of an attack on the fans.
The main culprits are on Facebook, but I've pretty much written them off as faker fans who are not actually engaged in communities and do not play and follow recent games. They're most likely people who once had a Dreamcast, haven't played a new game in years, and just follow SEGA on Facebook. When a new post comes up for a game that they don't recognize, they'll make a stupid "this isn't shenmue 3" or "where is nights 3?" comment, and go on with their day not actually giving a shit.