People react in two different ways when they realize they have been offensive (or wrong): they either apologize/downplay what they said and try to be more 'sensitive' about the issue in the future OR they double down in their approach to really ignite those who originally took offense.
Tarheels has clearly gone with the latter option and attempting to argue with him about the merits of Kyrie has shown to be a futile exercise.
The good news is, that outside of Kyrie, tarheels is actually a very productive member of CB and often adds a lot to the discussion about various topics. I think it's probably best if we try not to engage him about all things 'Irving' related, however, since there is clearly something going on there. Maybe one day he will come around on his own, but that day is not now.