In response to 1069... you raise a good point. Most of the people who bullied me back in the day were the "good kids", and I was made fun of because of my sensitive nature (which we know isn't okay if you're a "real man"). It was why I think very little happened to them... they were the moral majority and when the teachers were around they mostly behaved. But you know, even sometimes when I was being harassed by them, the teachers stood nearby in silent support.
I think though that it goes beyond sexual issues... it's the militancy of the middle class education system in general. It encourages conformity and a sort of status quo, and people who think outside of the box or tend to behave with independent attitudes tend to be the nails that get hammered down. The moral majority in this system tend to get more leeway with the behaviours they can get away with because they are openly and willfully conforming to the status quo.
The same sorts of structures exist in the work place. The working class are expected to perform, look, and behave a certain way. Those who don't tend to be the objects of bullying at the work place because they fall outside of the defined social roles. The bullies in that case are just the working class equivalents of the privileged students in the education system.