The context of the following conversation is kendall went along with jan's friends but didn't invite jan along because they didn't like jan.:
Jan says Kendall went out with my friends.  They didn't invite me to go camping with them because not all of them like me..
The friend responds That happens in large groups..
Jan responds It's hard to expect everyone to like each other..
The friend responds That's why I don't hang out with large groups of friends..
Jan responds There tends to be more conflict.  It's harder for everyone to agreed on things like what to do and eat.  Just basic things..
The friend responds Things can get complicated quickly..