I never said whether he was good or not.but if he can certify people can he be all that bad? But ... When someone's reputation is being questioned like that hope you can support what you're saying and a pm to that person would be a good way to handle it??
Its a small world in this industry. Your grunt today will be your boss tomorrow. And your actions and words will probably come back to you if you stay in it long enough. Good luck to both of you.