It is impossible for me to read this without pointing out that after a very well-reasoned and largely accurate argument against the completely irrational spite, you close with a (admittedly small) taste of the very disgust you just denounced. "I luckily rarely come across 'hipsters'."
It's pervasive, even in the group itself. Hipster doesn't actually mean anything specific to anyone, it simply means, "a member of the counterculture which I find offensive at the moment." And, shocker, the people who you would consider, "hipsters," are just as guilty of this.
The problem with this, from my perspective, is that it's also a catch-all for people who are difficult to categorize. Even before the word was co-opted to be a generally negative term, it was nebulous at best, referring generally to young people who are interested in culture or art or food or music or, really, anything.
As a result of this, people get lumped into this group based on these very general terms, and then assumptions are made about their character by regurgitating every complaint anyone has slapped the word "hipster" after, as though it's representative of everyone who wears sweaters. No, not everyone who has a moustache is an elitist. Not everyone who smoked pot in college loves Bob Marley, do they?
I encourage people to stop using this word at all. It's just stupid, meaningless, and devoid of positive connotations for most of the world.