Oh, yes, that's happened to me. One incident that stands out was during a really tiring week when my husband was out of town and I was the on-duty parent 24 hours a day for a week.
One night, we decided to go to the library for evening story time. We didn't usually do that but some friends were going to meet us there. So I feed everyone dinner, clean up, get the kids dressed in their pajamas, pack their sleeping bags in the car, and drive everyone 8 miles to the library. We get there and there's a sign on the door that evening story time is canceled because the librarian had oral surgery that day and just couldn't do it.
OK, fine, so no story time. We met our friends for a few minutes, checked out some books, and were about to leave. I was exhausted, and the kids (at the time, ages 5, 3, and 1) were disappointed and not ready to leave without story time, so I said, "Hey, we'll have a slumber party at home. There's a Blue's Clues special on tonight!"
Another mom (a crunchy-looking one) with two little boys looked at me, rolled her eyes, and said to no one in particular, "Boy, I'm sure glad we don't have cable!"
She probably thought I was a mom who always plopped the kids in front of the TV for hours every day, who never read books to them, blah, blah, blah, but the fact was, my kids were anticipating something special at the library, so I was going to try to do something special at home. Watching a kid show at 8 p.m. with sleeping bags in the family room seemed like a good idea to me, especially as exhaused as I was!
I run into that mom at the library every so often and she acts like she doesn't even see me, like I'm not worthy of her. Part of me wants to go over and tell her, hey, I've been breastfeeding every day since September 1996! We AP! We homeschool! We're a Mothering family! But I was so turned off and hurt by her rudeness and superior tone that one night.