as cornastasiaski says, bullying requires a strong input from senior management., individual teachers can only do so much.
Likewise there are teachers who are bad at teaching or have poor subject knowledge and there are those who are bad at behaviour management.
DD1 forbids me to complain about one of her teachers, because she says she is a good teacher who plans interesting lessons. She says it is not her fault that she has been given a set3 group who don't want to learn anything.
Ideally all teachers would have brilliant social skills and perfect subject knowledge, but that is not the world we live in.
Yes we need to be able to sack very poor disinterested teachers and weak HTs. However, we also need a society in which education is valued. not just by the pupils who will go on to get A*s, but by everyone.
Whatever a child's ability, they should have the right to attend appropriate interesting courses, where disruptive behaviour is not tolerated!