There are plenty of thick people who listen to grime, but at the same time there are plenty of very intelligent people who listen to it as well, and an even larger number of people with around average intelligence who enjoy it. Music taste has little to no bearing on intelligence, there are plenty of people who listen to fairly moronic music that are actually very sharp themselves, while equally there are a lot of people who prefer "difficult" or "clever" music who are complete morons. It is true that grime is often very popular among people from council estates and deprived areas who might not have benefited from a prosperous background and so may have missed out on the same education that a richer kid will have undergone, but this is less due to lack of intelligence but lack of opportunity, which it would be ridiculous to blame grime for. As for me personally I love grime music, and while I'm not claiming to be a genius or anything like that I like to think that I'm at least fairly capable of reasoning and functioning at a moderately intelligent level.