What a ridiculous person! So it is alright to speak a non-native language rather than a native language? How is that logic? This is as if a Turk would kick customers out for speaking Bavarian, Sorbic or Alemannic!
But they are stupid anyway. In Denmark, the Inuit from Greenland are also discriminated by Arab immigrants!
I ask myself who they think they are!
Welsh was spoken long before these filthy people flooded into Europe! Now they want to ban it?
As I always say: "Please, you have the freedom to withdraw from this place that you don't like."