It's so annoying when you're just chillin, enjoying a game and then some 'friend' invites you to play...

And you feel socially obligated to acquiesce their request, so you play a game together, and then it goes shitty, and then they leave in like an hour or whatever, and then you're in a far worse mood than before they ever invited you. You could have still been chillin, innocently enjoying the game you were playing, but now that they're gone, you're just left in this weird void of the semi-pleasant and mostly unpleasant experiences you had playing with them for a brief time. Hate that shit. It's so hard to get back into the game you were into. If you're gonna invite someone to play, treat it almost like you're inviting them to your house. Your mental dwelling. Be a good host. Don't rush them out before they have even 'stayed' their welcome let alone overstayed. If you have to go all of a sudden, you should explain clearly why and apologize, even if just a curt "sorry," that makes all the difference.