we have no male teachers at our school, but are lucky to have very good teachers, there is 1 teacher however that does not like boys. I heard the rumours and thought I will give her the benefit of the doubt. By mid year my son was depressed, he is a well behaved student and very quiet. he could name all the boys in the class and state the problems they had eg too slow, too messy etc. These labels were never put on the girls. Fortunately there were changes to class structure and my son changed class. So yes it does happen. This teacher was very abrupt and hard to talk to. I agree with getting involved with school and thankfully most teachers are very approachable with any concerns you have.