This comment will probably make me unpopular but so be it. I can only conclude this was during the MERKY event?
I have never seen fights happen at parties, raves or festivals where house music is being played. Be it deep house, techno or trance. I have partied with people from all ethnicities and we all spoke the same language. Just love and respect. I could dance with somebody's wife and get a hug and a high five from the guy after. Sure the type of drugs (xtc) will have a big part in this.
Grime, hiphop, r&b, reggeaton attract a different audience. Even with EDM and Dubstep I can feel a slight change in atmosphere. Perhaps this audience drinks more alcohol instead of doing certain types of drugs. The music and lyrics can be agressive or promoting violence. A wrong look at a girl can cause problems with their boyfriend. It's sad, but im afraid these events will bring more of these kinds of incidents and thus will mess with Ibizas' reputation.