Concerning “Pajero”: Yes, we are an international audience, but the language is English and I don't consider that word problematic in English. We cannot flag everything that might be problematic in every language. I would only flag obvious expressions to maintain the professional level of the site.

Maybe I should have phrased it inappropriate instead of offensive. Still, this answer is valid for obvious offensive names that should not be allowed, but it is also correct for localised ones like your example. If I consider a users name offensive or inappropriate I will flag it for moderator attention. The community (moderators) can then further decide what to do. In the worst case they ignore the request, that is better than cluttering the site with inappropriate content.