That was an insult aimed at the character of someone that disagrees with him. The metaphor was designed to do that more than it was to explain the issue.

And for me, that's been many of the red flags that I've seen along the way. People talking about the inability of their opposition to understand because they're too stupid. Or too authoritarian or too religious.

And then there's this technique that I see, shift to argumentum absurdum... then make a joke about it to disparage your opposition but not really make a point.

Neckbeards might be better at insulting their opposition, but that doesn't make them right.