The idea that the intelligence level of the person propounding a position is some direct measure of its value is one of the more inane things you see in society today. Utilitarianism is an awful doctrine and it seems to be exclusively smart people who embrace it.
Mind explaining what is wrong with Utilitarianism? Never seen anyone coming out as strongly against it, though I'm not really one for philosophical debates. Agree with the intelligence part though, smart people can have insane beliefs about certain topics.