I've personally hardly had any problems, inside or outside school. I was called 'sudaca' (southern) a few times but that's all. Some of the boys and girls who called me this are now friends of mine. Mind you, I might not have suffered harassment, but some friends of mine have. I know some boys from Peru, Colombia, the Dominican Republic the Philippines and China who have all been called names. It seems to be girls that get called the worst names, I know some who've been called prostitutes just because they come from Colombia and the Philippines.
My hassles have more to do with my future because I'm not originally from Spain. I wonder if when we're adults we'll be treated the same as 'native' Spaniards. I mean, I've got dual nationality (Peruvian-Spanish), but people can tell from looking at me I'm Peruvian.