if you saw a sign reading "No Blacks served" or "No Asians" or "No Irish" (how this whole discussion started), would you consider it as unimportant as you seem to in regard to Travellers, and tell them to "quit whining"
Look forward to your answer with some interest.

I expect they're about as common as "No Travellers", "No Blokes Called Jim" or "No Martians" signs. I'd be quite ready to call the police on my mobile demanding action if I see Jims or Martians discriminated against too.

Are you similarly insistent that Americans take action against all those signs telling Blacks to sit at the back of the bus?