My gripe goes back awhile: I submit Garrett Wang. It's not about his acting abilities, it's a personality thing. I was smitten by his portrayal of fantasy dreamboat Ensign Harry Kim in the StarTrek: Voyager television series.
I happened to come upon a television interview of Garrett Wang in which he appeared dressed in grunge along with shoulder-length hair (as distant as he could get from the minty-fresh, preppy Ensign Harry Kim). While slouching in the chair, he rendered disinterest, arrogance, and a condescending dismissiveness. I was left traumatized knowing that I wouldn't give Garrett Wang a second look, but would crawl through broken glass to get to Ensign Harry Kim. Garrett Wang is now 51 years old (it seems like only yesterday).