....why does this make him look bad? That he called out the obvious thing that everyone knows?

That he's talking shit about Altman who is, at least in public, only talking up Anthropic. This will only play well with people who hate Altman, which is not the majority or even much of the public. It plays right into Altman's hand who can do what he always does which is play his "smol bean billionaire" role and act like a victim of big bad Amodei.

Just because you hate Altman doesn't mean everyone else does! Most people just know him as the guy who makes ChatGPT which most people like.