Just to flip the other thread on its head.
I am childfree by choice, I don’t hate children, I was a nanny for a number of years. I enjoy spending time with my friends children, but for various reasons it’s never been right for me. However some people with children have made some howlers of comments about this.
My two favourites remain
“You’ll grow out of it” as obviously not wanting children is hugely immature.
“You must just not have met someone you love enough or you’d want children with them” this drives me backwards as I ended up breaking up with someone I adored because he was desperate for a family.