9 times out of 10 I either greet and others respond in kind at the start of the run, or others greet and I respond. Some people are queueing up for roulettes to get in, get their glamours/tomes/gil/etc and get out asap and see no need for small talk. I don't think that's really toxic behavior. The whole Netflix and refusing to dodge anything...yeah, that could probably be viewed as such. Such players are hardly the majority though.