Normally, I think it's best for people in Andy's position to keep quiet on these things, but as Cowan sees fit to present daft and potentially hurtful opinions as fact when it comes to Andy, then it's hard to object to perfectly reasonable criticism back, especially when it comes with actual knowledge.
It's nice to see Andy sticking up for himself. Although I do worry that he's feeling a bit reckless because he's on some super-strong painkillers. Not that I think he'd regret WHAT he said, just that he said it in public, lol. That said, there isn't much to lose. Commentators need to realise the consequences of what they say on air.
I too wonder sparkle if it something to do with the meds...on reflection it is a tad unprofessional, and Andy is always so PC.