OK, explain how they don't 'mean anything'. The guys is expressing his opinion. No doubt in somewhat vague terms, but I feel like I have a good sense of what h

OK, explain how they don't 'mean anything'. The guys is expressing his opinion. No doubt in somewhat vague terms, but I feel like I have a good sense of what he means. Also it's easy to say to anyone who expresses an opinion to back it up with a rigorous scientific study. But that can simply be a rhetorical technique to limit discussion.