I'll admit it freely: if someone has made a conscious decision to mark up their body in order to send the message that they're a badass little gangsta, I am going to take that into account when I judge them. Is that somehow unfair?
When did people get the idea that nobody should ever judge for any reason???
But, isn't that why they got the tattoo in the first place? They wanted to be "judged" as cool or hip or whatever! They wanted to have people know at a glance that they are with this gang or that gang.
So - NOW they don't want to be judged?
PS... I admit it - I judge people based on the large tattoo on their head and the number of piercings visible while fully clothed. So shoot me.