People who hate Wal-Mart and won't shut up about it, yet who continue to shop at other big chain stores. I don't care where other people shop, but I get tired of hearing about it from self-righteous snobs (yes, I'm generalizing). It wouldn't be so annoying if more of the complainers shopped only at small businesses or secondhand stores. If Chain X is the source of all evil, how can Chains Y & Z--not to mention A-W--who do the same sorts of things, not also be evil and worthy of ire?
Low-rise pants. They look okay on some super-thin girls, but they flatter no one. Most girls look very bad in them. Women of, as they say, a certain age shouldn't go there at all. (Especially when they're pairing their low-rise pants with a cropped top that shows off their wrinkly, stretch-marked, fortyplus-year old bellies and bellybutton ring or tattoos.) I'm not so lookist to care if people look good or not, but most of these sad people are obviously trying to look good and failing really badly.
Visible bra straps. When I was a girl, only the trashiest of the trashy went out with visible bra straps, and even then it was usually the result of extreme carelessness. Now some girls do it deliberately. It still looks trashy.
Flip-flops. They're great for the beach or for public showers, and they are economical (at least they used to be); but if you're a middle-class girl in one of the most prosperous countries ever to exist and you are wearing a nice dress, buy some shoes or a pair of decent-looking sandals. Hot gluing an artificial flower or some sequins to your flip-flops do not make them formal wear. No, not even semi-formal.
The use of the word "pimp" to mean anything other than a procurer, a pander, a low-life trafficker in human flesh, an exploiter (usually of women.)
The use of the word "ride" to refer to automobiles. I first heard this word in the early '90s. It sounded stupid then and it still sounds stupid.