Wow. I haven't heard anything truly rude so far. The only comments that are bugging me are people wanting to know the baby's sex, and a co-worker who asked to see pictures of my 8-week ultrasound. I don't understand showing off ultrasound pix--hello, that is a picture of my naked child and my private parts, and anyway it is kind of creepy like an X-ray. Did I ask to see the X-rays of co-worker's broken leg?? But I just told her that there wasn't much to see at 8 weeks, just fuzziness with a head and heartbeat.
As for people asking the sex, my favorite is when they say, "Do you know what it is?" because I can hug my tummy and say brightly, "I think it's a BABY!!" and most people find that funny. But honestly, why do people care so much about that? Especially strangers on public transit and such. We did not know our first child's sex until he was born; with this one, we'll know any minute now when we get the genetic testing results, but we're not going to spread the news. We want to get gifts in a variety of colors.