" I am not claiming the right to do anything nor denying anyone else. "
You are claiming the right to offend races and ethnic groups by singing songs that give offence becao=ause of ther origins or their colour

Well, of course. Everone has the right to offend.
After which people may learn something about them.
And sometimes, people already know something significant about the person singing.

But I don't know if this is the case in the UK.