I've just "dumped" (for reasons that will become clear) a friend who doesn't boast about how smart her DD (7) is (even though she is actually smart) but how nice she is. Ha - She's a little rotter, and the reason I've phased my friend out is because her DD picks on my 4yo son something rotten, she's really nasty, and fuck all gets said by my friend. Oh but woe betide anyone who speaks to Precious in a way she doesn't like. My (ex)friend has accused a poor girl at her DD's school of bullying (she's actually said it to her face!) despite the fact her horrible DD sounds like she's much worse - such as laughing at this girl in swimming lessons because she still wears arm bands and constantly telling her that she's a better speller/writer/reader/drawer than the girl she claims to be a bully.
I've seen exfriend watch as her DD throws her little sister's toys across the room and says nothing. But if little sister so much as touches Precious's toys Merry hell breaks loose. Precious calls my son awful names, screams in his face if he touches her toys, tells him she doesn't like him, excludes him. Last time I saw them, exFriend gave Precious sweets to pass round everyone. She didn't give one to DS as "I don't like you so you're not having one" then ate it herself. Exfriend just kind of simpers and says "oh dear". I have absolutely no problem telling her to stop being awful though and behave herself, how would she like it if someone treated her like that...both her and exFriend look horrified. She is not a child who's used to being told off. And if anyone so much as disagrees with Precious, there's tears, demands of an apology, exFriend goes and fights her battles for her no matter how ridiculous - once she said to my DD "Precious is very upset because she wanted to be the pink mermaid in your game, but you said you wanted to be the pink mermaid. That's not very nice MiniGlummy"
it just got so fraught with me stepping in and pointing out how ridiculous it all was and we don't need to police the playtime of 7yo's.
Anyway, exFriend constantly posts on SM about her sweet DD, can't believe how kind she is, what a good sister she is and she only wishes she was as kind as her DD (🤮). We were once playing a board game that had a symbol on the dice where, if you rolled it, you could push someone back to the start. Precious rolled that symbol and exFriend was all "Now Precious please don't feel you have to push someone back, I know how kind of a person you are and that it would break your heart to do that.". Precious of course immediately pushed her mum's piece back to the start 
The sad thing is her youngest is absolutely adorable and the sweetest little thing with the biggest heart - nothing ever gets put about her on SM and exFriend treats her completely differently. I predict she's going to have hell with her oldest when she's a teenager.
It's also sad because exFriend was actually an amazing friend and person pre-children, we've been through a lot together, and I held on to our friendship because we had such a great history. But I've realised I can't be friends with someone who infuriates me that much and who allows my DS to be picked on so much.