I don't get racist people?

Ok, I'm not being immature here, I want proper answers here. I seriously have no idea why racists are racists. They moan about people being black and then they go on holiday and get a tan? What's that about? I don't see why people can't understand that we're all EXACTLY the same, human. Yeah we might look a bit different but we're all the same. Has anyone seen that video, where there's loads of different species of monkeys all together? Why can't we be like that? Racism just pees me off to the max. When people say you're being racist by saying the n word, why? Why should the word be racist at all? And those dolls kids used to have called golly wogs, why was it made that they were racist? Surely it's being pro different races because the children don't care what colour skin their doll has. Also, i can't remember where it was, but it was that case of the children having to name the cl bear or pet or something, and they named it Mohammed and the teacher got arrested or something. Why was that being racist? If calling a bear Mohammed is being racist, then why is called a bear Peter or something not? It's a name, seriously. The only reason people are black, white, asian, irish, italian, african and whatever is because the place they came from. The world is one place, so why is it being split up? And when people say 'everyone is equal', if everyone really is equal why are there people that think their race is better than other people's race. I want some answers and even if you're all going to call me stupid i don't care because even if you do think i'm stupid i'm pasionate about this. Thanks for reading