I'm going to say something that's considered taboo in parenting communities: my kids are smart. They are curious and inquisitive. They love books and reading. They experiment constantly and with impressive insight as they try to figure out problems. And from their earliest days in a classroom setting, every one of their teachers or caregivers has pulled me aside and in the same very serious voice said "S/he's so smart." And I always smile politely and try to be humble and maybe even demurely dismissive, as I say "Thank you."
Bringing up the fact that your kid is smart earns you pretty much all the snark from others. I simultaneously get it and don't get it. On the one hand, bragging is unattractive and some parents of smart kids are shameless braggers who feel like their child's "advanced" status puts those children (and themselves by virtue of being the parents of such magical creatures) in a special category above everyone else. There's no need to go on about any of your child's good qualities. But why is simply admitting your child is bright so brag-y? If you delightedly squeal "My daughter is so cute!" (unless you go over the top or do it constantly) no reasonable human is going to begrudge you that. But if you proudly say, "My daughter is so smart," people, especially other parents, bristle.
Because somewhere along the way people began to think that "my kid is smart" really means "my kid is smart...er than yours."
Because of the unspoken law of never admitting your kid is a brainiac, the challenges of raising a smart child are not often discussed. But this is a safe space, people.