I usually check after letting up a goal, but not as much after scoring a goal, all other whistles mostly check, sometimes don't. I actually find it to be good practice at trying to line up a check sometimes, for the not so talented as myself. I see others practice tic tac toe passes after whistle if it's lined up correctly for them.
To me everything is all in good fun whether I lose 13-0, or win. Yes I want to win, but I just like playing this game, and am thankful to have found a site that allows me to the way this site does, I contribute zero other than playing so again I am just thankful.
Also I don't know about others experience, but being a noob here yes I've noticed the clique sense people speak of, but also most if not all of those guys some categorize as in the clique have been nothing, but welcoming, helpful, and friendly. Heck the 2V2 might be the biggest clique around, and it always seems they are open for new dudes to GA anytime!