But he pretended to be an expert in climate change although what he said about it was full of shit, so how do I know he's not also full of shit in psychology? S

But he pretended to be an expert in climate change although what he said about it was full of shit, so how do I know he's not also full of shit in psychology? Since he's also generally a blowhard (at least in my view, which I'm aware is biased), I'd look carefully before learning from him.