Don't use buffs at the start of the fight, that will sure make everything and their friends target you, lol. Stuff such as Profoundity or any other self buffs are also bad idea.

If you start a leve, you will - ALWAYS - be targetted by mobs that pop (necrologos, defense type leves, etc), like it has already been pointed out.

Hitting mobs with Elemental Shroud and having the Out of Sight trait also are little things that can help reducing hate.