What to do about bullying

Hi,I'm at an all boys secondary school in the UK and there has been one certain person in my class who is particularly homophobic. He kept saying how gay people are messed up, against nature, that God hates them, are fucked up, have a mental disease and should be killed in their sleep. He is in every single one of my classes and I am not exaggerating when I say that he does or says something homophobic every four minutes.He has been really sly about it and I think it is directed at me because I am the only out gay person in my year and if he was respectful, then he would not say it around me. He kept making fun of same sex parents and, 'two dads' is an insult that was used. He would be again, very sly with this, asking language teachers how to say two dads in another language, laughing as soon as he said it. He said during Phys Ed that he was having a 'Two Dads Race' and that the last to finish the race would have to get adopted by two dads.He constantly accuses people of being gay and touching other people and it makes me uncomfortable whenever he does this. He will laugh and say how they are fucked up and that they need to pray it away - strange since he's not even religious. He sometimes hits people after accusing them of touching someone else when they obviously haven't, and says that they deserve the punishment.The problem is that I have been to the deputy head teacher of my school about it and while they were very supportive and did everything they could - excluding him, taking him out of classes, calling his parents in, nothing seems to have worked. I have actually been to the deputy three times about it and every time, his parents are called in and this bully will stop being homophobic and actually claimed that he is accepting now. He will naturally start again after a few days.I don't know what to do anymore because this has ruined my reputation in the year group. People are much less open to talking to me as a result only because I don't want to dread going to school. This bully is getting more sly every time, instead of saying 'two dads' as an insult because teachers are now looking out for this, he would show people a photo of a mother and a father and say, 'are you jealous?', even when they have heterosexual or what he says 'normal' parents. Whenever gay is mentioned in class, he will look around the classroom and start accusing boys of touching each other. He says, 'you know what you have', and 'do you want me to say it?' instead of two dads now but it is still just as insulting. He even 'impersonates' gay people by walking with his hands moving everywhere and making a 'gay voice'.Nothing I do now will make this better and if I go to a teacher again, my reputation will be ruined further. What should I do? I'm beginning to get depressed and dread going to school now.