1) When you answer a question or make a statement and people take it as a humble brag. My mother got irritated with me for mentioning a study abroad trip in conversation with her cousins. I've studied abroad WAY less than my friends and wasn't even thinking about it, and they specifically asked if I'd been out of the country. I'm not going to lie about it. Similarly, a friend pressed and pressed for my official IQ score range and several rounds of "I don't really care about it" and "It doesn't matter anyway" later, got miffed when I told her and it was higher than hers. However, I also hate the humble brag and compliment fishing. Like "Ugh I just ran 15 miles but I ate a piece of cake today. I'm sooo fat" and what have you.
2) When you have to dress a certain way to get service in stores. I know I've griped about this before but I had the WORST Sephora experience the other day. Usually the sales associates are all over me, asking if I'm SURE I don't need help, etc. I had just gotten my brows threaded and I don't wear makeup to that because I end up crying it off. When I went into Sephora I might as well have been invisible. I spent quite a few minutes hunting around the store and not one of the associates asked me if I needed anything. When I finally pulled one over to get help, she took me to the section and when I said "Oh thanks, it's here" she just said "...great" and ran off without asking if I needed anything else. And no, it wasn't crowded that day.
3) When my girl friends gripe to me about how much harder it is to be a mother and juggle all the stuff they have to do than it is to live my life. Granted, they never explicitly say that so I never feel comfortable directly calling them out about it, but I do not have any sympathy for you. You chose to have a kid and I didn't. Is life hard? Yes. Will I sympathize with you all day long and listen to your complaints? Sure. But you don't get to cut me off if I want to complain about something and say "Oh, but imagine how hard it would be if you were a mom..." It's never "If you had kids", it's always "If you were a mom", as if moms are on some Other, hallowed plane along with the Virgin Mary and they've given birth to another Christ.