People with a Monopoly on Cool

I (thankfully) rarely meet these type of people, but over the last little while I've met a couple of them, and it's sort of disturbing. If you're wondering, I'm talking about people who seem to think that they have a monopoly on what's cool -- those people who either berate you or give airs when you suggest that something not to their liking could actually be liked. I find they generally tend to hang on to some slightly obscure topic from which to define themselves, and when discussing that subject, no other preference other than theirs is acceptable. The whole thing can be shrouded in elitism, since clearly their views are superior (and ergo, they are) to yours (you).
Now, I know that I'm probably one of the more argumentative people out there, and I definitely have strong opinions on some subjects. What I'm talking about here is completely different. In any argument there is usually an exchange of ideas and movement in the positions. Usually in the cases I'm describing here, there's an a priori 'truth' put forward that is usually completely subjective, and therefore unarguable (unless you like, 'no it's not' 'yes it is' etc). They cling to this internal truism and act like there's something clearly wrong with you if you don't believe the same thing.
Both of the people who I met that led to this little diatribe happen to have been women, although I'm not sure I'm quite ready to extrapolate from my sample size of two. As frustrating as this whole thing is, at least it serves to spark some sort of reflection, since the first thing I thought was 'God, I hope I'm not really like this!'

Second in the things that I have issues with are people who can't take any jokes made at their expense, but that's probably a topic for another time...