I'm very lucky that so far, my kids friends are nice, and their parents are nice, we all sieem to have fairly similar attitudes towards parenting. The odd couple of slightly brattish kids (and my DS has his moments too) I try to limit time with.
However, I have lost a friend because I couldn't stand her duaghter. I was this little girls godmother, and found it so hard to be around the whining attention seeking little darling, that last time I saw her was 3 years ago, when I delivered a birthday present. She didn't even thank me, and mother didn't prompt her too. I decided enough was enough.