How often do you play with friends you know vs how often you play solo games.
SOLO games experience this stuff maybe 1 out of every 3/4 games?
I play with someone I know about 1 in 20 games. I have more then one account I use at different times and for different reasons, so yes I understand that this is rage/ trolls/feeders etc.
There is a point I'd like to make: You Don't have to be a jerk to deal with these types of players..You can even say things back to them, as long as you do so in the confines of the TOS... Just because someone makes you mad during the game doesn't make it right to make others uncomfortable by stooping to the level of being an Ass.
Back to the point of the OP...For me as with Many others "flamers" can be much worse then an intentional feeder, for one thing it can upset people and ruin the game faster and make it more likely to go on tilt...Won't bother explaining why this is I assume everyone can figure this out...Now someone who intentionally feds because they are upset and having a bad game make the experience less then stellar but your not getting cyber bulling coming from these people (usually) .