I didn't mean to contrast the two with each other, but both with "disingenuous", of which they're synonyms.
And those are two very different things that don't got much to do with how big the words you type are.
It's easy to not be entirely honest in an argument due to various biases, or when you have some sort of emotional attachment to an argument. That can be a reasonable thing to point out.
Calling people stupid, on the other hand, that is pointless and purely inflammatory.