Common Annoyances

What is it about pregnant women that makes other people feel they have the right to make completely inappropriate comments? It's not enough that I feel like a beached whale, that I wake up every time I need to roll over in bed and rearrange my pillows so I can breathe, that simply getting in and out of the car requires a major exertion of energy. Now I have to put up with idiot comments as well? I've had several people ask me if I'm having twins, and a man at a recent church potluck looked at my plate and joked to the whole table that I was "eating for three". A male relative (who shall remain nameless) recently asked me how much weight I had gained, and then dug himself deeper by explaining that he only asked "because you're so much bigger than the last time I saw you." Even a few women, who should know better, have had the audacity to say "look how big you've gotten!" or "you look just about ready to pop!" At first I found it rather humorous that there were people so tactless and stupid as to make such remarks to hormonal pregnant women. But now my patience has run out and it just ticks me off. It's even more frustrating because I haven't added as much as I expected to my figure, except for my big belly (which I find very surprising, considering that I had been warned to expect weight gain all over). My doctor says my weight and size is normal, and I shouldn't worry about it. I'm tempted to tell off the next critic who feels compelled to make a rude comment. How can people be so clueless about basic social etiquette?