If the skinhead is behaving in a civil manner then I believe that he should serve him. It is unlikely though that a skinhead would go dine and support a jewish restaurant though. Ghandi once said, "You need to be the change you wish to see in the world".
And if he knew you were using that quote in this context....
You do know that Ghandi was a friend of Hitler, yes?
Gandhi was everybody's friend.
I assume you're going to point to the letter, next, and so I will borrow a quote from one of the commenters here:
http://www.buzzfeed.com/cconnelly/ghandis-letter-to-adolf-hitler-s3xYou may be surprised to learn that pleading with a man and then calling him a giant douchenozzle doesn't win many points in diplomacy. There is no indication in the letter that he had an actual face to face friendly relationship with Hitler, in fact it reads as one who is addressing someone they've never met.
And another:
It is a common Indian practice to address strangers as 'friend' or 'brother'. In fact Swami Vivekanand, an Indian Philosopher , while addressing a conference in Chicago in 1893, started his lecture by saying," My Dear Sisters and Brothers of America.." and he got standing ovation.