Ignore him. He seems to be disingenuously taking your "who cares?" as a literal question, rather than the universally understood "So what? I don't care".
It isn't just being PC though, is it? I genuinely don't care if a Chelsea reserve player BATS* for the other team. It honestly just doesn't register as being worthy of any thought. Any more than what car he drives, or what music he listens to.
*you can have that one for free.
BUT - and here's...