You'll have to decide if he made his case or not, but if that's what he thinks then better he just come right out with it instead of dancing around.
Note that he did not call James ridiculous, he criticized the idea. Which is how it should go (if there's going to be criticism).
You can debate whether his assertion is justified, but some (many, perhaps) ideas really are fucking ridiculous and it's better to just cut to the chase.
You'll have to decide if he made his case or not, but if that's what he thinks then better he just come right out with it instead of dancing around.
Note that he did not call James ridiculous, he criticized the idea. Which is how it should go (if there's going to be criticism).
You can debate whether his assertion is justified, but some (many, perhaps) ideas really are fucking ridiculous and it's better to just cut to the chase.