Of course, some let it go to their head, like the guy in the picture (courtesy of this very informative blog). In my opinion, tattoos do not make the douche but they certainly don't help their case either. I feel that a douche is gonna be a douche no matter what, and the fact that he has tattoos may embolden him to take off his shirt even more, but that's about it. Yet it is statistically proven that the occurrence of tattoos bears a direct correlation to the likelihood of douchebaggery.
Even in China, this fact holds true. It is quite rare to see someone fully tattooed up in China, but if a douchebag-inclined dude has a tattoo, you can be sure that he will show it at any opportunity. This means wearing tank tops in cold weather, bearing one's torso with one's buddies while consuming barbeque and beer, and hanging out with skanky-looking girls so everyone knows that he's not a goody-two-shoes. Of course, more often than not, their badge of machismo will be a bland tribal design on their shoulder or a generic dragon on the pectoral muscles. And while I've got to give props to my comrades in ink, I can't deny the major douchebag vibe I get when I walk past these guys. They usually stop talking and gawk when I walk past, but I don't acknowledge them. I am proud to say that no matter what I look like, I am most certainly not a douchebag.