I mean, in my idealistic? world view, all kids are fab and have their individual talents, most kids are pretty special at something.
So why can't parents say 'gosh, my Olivia is fantastic at digging sandcastles, she is really, really fast - she makes them in, like, under a minute' without other parents immediately taking it as an attack on their child who doesn't possess said skill (yet)?
My little girl is great in some areas of achievement/social skills but she can't do things that other children her age-ish can. That's life. I hope to teach her that she might be able to do things other children can, but they will know/do other things first.
My dd DOES not sleep through - even now aged 3. But it doesn't bother me, if other people say 'my baby is sleeping through aged 10 weeks' though I may be .
So AIBU to say CHILL OUT - your child is still fantastic and the BEST to you even if they can't do whatever your friend is supposedly 'bragging'about. You'd probably have something else to brag about anyway.