Because no one second guesses Johnny Demon's ability, and we never second guessed Clemens' either. We're pissed they went to the Yankees, that's why they get bad mouthed. Arroyo, at least in my eyes, was a very good contributor to some of our success and gave a huge number of quality starts IMO. I will not bad mouth him on the way out.
You think we talk s*** about their ability, when what we're actually saying is out of anger that they went to our rival. But yes, if people were trash talking Arroyo on the way out, then I disagree with them.