I have been in bad sports before, and have been careful not to go back in. I do have friends which is the reason why this is bullsh*t. I have about 7-9 different groups I play with on a regular basis. and 6 of them are on GTA:O. I normally have ~32 friends online with at leats 20 of them playing GTA:O at any given time (i have friends with all kinds of sleeping schedules so that I always have a familiar face to play with even if its midnight.)
Sure Bad Sports is "fun" except for the fact that I can't help my friends rank up, I can't play deathmatches (my favorite) I can't go on car cruises with friends. I can't gunplay kids on the street. Everyone is in tanks and killing people over and over and over in tanks is definitely not what I consider fun. I always win, I never die and there is no challenge. At least with Deathmatches and missions there is the chance that I will die making me have to rethink my tactics.
I have friends i constantly play with and none are bad sports. Ontop of no one playing missions/deathmatches.
Also to make things clear. Last night I did three missions with my friend (trying to rank her up) then we went to free roam hung out in my apartment for 2-3 minutes then I clicked "find new session" and then when I connected to the new session I hit "leave GTA:O" then once I got to single player turned my xbox off. So no, I didn't destroy any PV's, or kill anyone or get voted out, or leave a mission. I exited GTA:O like I always do. (give it time to save then find new session to ensure it saves then leave.)