Yeah, I was - nothing major, just occasional "Are you a boy or a girl?" queries and people laughing at me when I sang, even though I was good. And some girls in my year just not liking me for some reason. Some of the "popular" guys were mean to me too.
It upset me at the time and I was lonely at school till about year 9 when I found a great friendship group, and I was good at sports and music, which I think helped maintain a level of confidence despite the background hum of nastiness.
I also got over it as I got older and grew in self-awareness - this included a mixture of blossoming with puberty and braces and realising I wasn't ugly, as some people seemed to want me to believe.
Since school, some of the guys who were mean/indifferent have tried to get in touch/ask me out. Ha.