I know some will disagree, but a big one for me is women who get implants when they really shouldn't. I think a lot of young women get mixed up into thinking most guys' preferences for breasts are just size-based, when for a lot of us it's really more about shape + whether they fit the rest of your body.
For maybe 10ish percent of women with implants it makes sense, because they naturally have breasts that are awkwardly shaped, or strangely small for their body frame, and they come out looking very good. But, it feels like ~90% of these girls have really nice B-C cups that really accentuate their bodies well, who inexplicably turn them into balloons. Anyone fitting in that 90% category, I have a very difficult time getting into any of their content post-surgery.