I'm so tired of hearing I have a small belly

I had my first 3rd trimester ultrasound yesterday and found out my baby is 2 lbs 15 oz. the doc didn't have anything negative to say, but other people seem to all tell me my baby is small. I weigh 143 and gained 28 lbs so I feel I'm right on track and so is my daughter. I'm 30 weeks now so I still have more time to grow and obviously the baby does too, so why are people so annoying? Does anyone else get super annoyed by belly bump size comments?