"Eh? Surely the definition of "common" in this sense is related to how widespread/frequent something is"
Exactly - which as nothing whatever to do with the number of pubs there are.
By your logic, putting up a 'no Travellers' sign on say, The Kings Road in Chelsea, or Knightsbridge, or Oxford Street... would be comparable to putting up one saying "beware of the crocodiles" - it would effect no-one, yet all pubs in these areas would count in your calculations

"Would you say there were 500 pubs showing these signs at any one time? More? Less?"
No idea - but I would say that I would guess that well over three quarters of the Travelling population in Britain today have been effected by this and similar discrimination - that is what I would describe as 'common'.
"Have you seen the ad at the top of this thread?!!"
Peggy and Ewan, along with Charles Parker did far more than anybody I know to raise the awareness of the problems experienced by Travellers in Britain - leave the ad where it is, it has far more relevance to this thread than many of the contributions being made here.
"Discrimination that only exists in rhetorical examples doesn't oppress anybody".
We are talking about a particular form of abuse that does exist - you have no grounds whatever to say I am lying - your own evidenced is based entirely on what you have and have not seen.
Had you said "I have spent a significant amount of time with Travellers and I know they are not being discriminated aginst i this way, you might have a point - are you saying that?
"That does not really clarify it at all Jim!"
I am not saying anything of the sort - one more time - "Racism is a complex issue and has many causes."
By the way - Powell was thrown out when his rantings became an embarrasment to his party.
The shite is all yours
Jim Carroll