Transferring is tough socially unless you're quite outgoing -- I'm not. In my case I'm lucky to have friends in my new school's city and other things to keep me busy. I'd say that  student groups and  other transfer students are your best bet for finding some new hangout buddies.
I haven't encountered hostility (that I've noticed), but there are definitely cliques that were formed during 1L. This is to be expected and, of course, none of us made the move up to the T14 (or wherever) for the party scene and hot chicks/dudes.
In terms of overall environment and the tone of discourse on campus, I'm actually quite happy so far. There's no need to act like an arrogant blowhard or know-it-all here, something I saw just a bit too much of where I was previously.