What is the easiest way to piss you off?
Be prejudiced. Make wildly unfounded generalisations, or perpetuate stereotypes. That applies to supposedly trivial things like the appreciation of art and music too - personal preference is one thing, but to dismiss entire aesthetics with only a passing familiarity is, I think, potentially indicative of a wider lack of empathy.
Not saying “if you don’t like blah, I dislike you as a person”, but…
