Ugh venting

Why do people feel the need to comment on bump size? Like for a ftm at 6 months pregnant I'm pretty average size but I keep hearing oh you're so tiny. Like just dont say anything at all...that comment makes me feel like my baby isn't big enough and she is the perfect size and weight right now. Do you guys get comments like this (big or small)? And how do you deal with it? I just nod and smile cause it's usually followed up with you look cute or smth and don't want to be rude like but it's actually annoying...