I've never known a hipster to have any concern for security or self-defense. Think about it, how many thousands of “I'm having a party at [address] on [date] starting around [time]” posts have you seen in public portions of the internet—particularly on websites which are dedicated to creating false connections among strangers?
The comment was meant to be taken lightly. I live in Kanuckistan, where being a hipster is cool, and owning guns is illegal.
I too would like to hear more about the incident, if you are willing to share.