Agree, but I hate most people who run with their friends for a completely different reason: circlejerk toxicity.

If they are terrible, it's your (and anyone else not in their group's) fault and they have all their friends testify. They got knocked out by landslide during Titan EX? Your fault, you pushed them! They stood in every one shot mechanic ever? Your fault, you didn't heal them well enough. They couldn't pass the DPS check and the boss enraged? Your fault, you're not doing enough DPS as the healer/tank! They got hit with every single divebomb, your fault even though you didn't have the indicator on you. I could go on forever but yeah, I can't stand people who group with their friends and blame their bad gameplay on everyone else.