Luckily, I have never had anyone pass a comment like that to me, I'm sure I'd floor them!
DD was born 7 weeks early because of my pre-eclampsia. The C/s was because of my health.
DH was understanding & asked whether I felt bad for having a c/s & I said that it was a minor part in the whole scheme of being a Mum. It doesn't even cross my mind.

A friend of mine had a bad encounter at the hospital after she'd had an emergency c/s & her DS life was in the balance. That is the worst thing I can ever imagine.