Why do you think Socrates angered the official in Athens so much?

Socratic philosophy, at its core, is about not accepting that things are a given. "It is the way it is," was not a valid answer in his view. Everything is open to being questioned, and everything should be questioned.

Obviously, if you're a wealthy and powerful aristocrat, then somebody who spends all day going, "But why should we listen to this guy?" is not going to be your favorite person.