Surely it's "the right to not be offended doesn't exist"
I think the point is that while people can be offended by whatever they want, just "being offended" doesn't give them any more privileges or powers than had they not been offended. Despite what they may think or believe.
In general, the correct response to "I'm offended" is "Oh, dear, so sad" the first time, and "So fucking what ?" the second. With apologies and respect to Stephen Fry.
The fact the UK has to have food banks for people to live deeply offends me. Now where's my wind-up plod to set on the Tories ?