Mine were a friend in high school (we were around 15) "You'd be so pretty if only you got your teeth fixed."
I have a long European surname, and my first name has 3 syllabes. I phoned up about a job once, told the guy my full name. He repeated it to me as a question, and then laughed down the phone at it.
Told by my abusive ex partner several years ago that I was 'nothing', and a 'parasite'. I had done nothing to warrant this.
Not really rude but just amusing, when I was 27 a friend's partner told me that if I wanted to have kids I'd really better hurry up 'with my age'. Would be interested to hear others.