Playdat, if you sense attention whoring and competition in that one group, go with your intuition. At work, I have several extremely insecure women in their 20s and 30s, even 40s who constantly compete with everyone for attention. It's getting so bad they're making up illnesses and shit to compete for more attention and get mad at people when they're acknowledged for an achievement, personal or professional. Little do they know, the rest of us think its hilarious. I distance myself from these people without being rude, although I will troll them when it gets bad. Lol
To answer the question, I grew up with emotional toxic people and didn't realize how horrible they were until I met my husband's group of friends. It's been over 10 years since I was close with some of these people but they still try to keep me around, even though they are directly spiteful to me for trying to distance myself. I could be a pushover with people I cared about when I was young and stupid, but not as much anymore and they see that and don't like it. We had a lot of mutual friends before, but only one left I still hang out with. I always hoped we would naturally drift apart, but they're doing their best to prevent that because no one else would put up with their shit.
But, from them, I've learned to be a better judge of character and put people in their place if needed. My friends now are people I've consciously made the effort to be close with because they were good people. Some old friends, some new. I don't fall into the trap of becoming friends with people out of convenience. Some of our friends have other friends come around who I wouldn't hang out with normally, so I'm always nice and respectful when we see each other in a group. But I'm not going to go out of my way to build a relationship with people I don't really like when we have real friends and family we don't see often enough and I'd rather spend time with.
Needless to say, when we started picking and choosing friends, we now have amazing, positive, supportive people in our life and around our daughter.