Been around lots in boarding school, actually. Firstly in Singapore, a Malaysian fucker who made his life mission to make mine as miserable as possible, (I'm Eurasian) stirring up as many people against me as he could. Just before I left that place I broke his glasses and his nose (and I have been in about 3 fights my whole life, so this was a big thing for me ok).
Also witnessed a lot in Western Australia, some really rampant racism going on there, towards Asians, from Asians, and the whole society in general towards and from Aboriginals. From wild verbal abuse, to actual beatings. Not much you can do, except try to get along with everyone...