I'm no Trumper and don't really give a *****, I like making fun of most of you for being partisan idiots who dig their heels in no matter the cause.
With that being said, as it relates to this thread, as noted above if there is a video as people keep claiming, let's see it. Otherwise this is no different than an unsubstantiated trade rumor on the Stadium Wall.
As far as the vocabulary lesson goes, I don't believe that dim is any more or less common than dull. They are both antonyms of bright and sharp respectively which are probably similar in usage as well.
At this point, like someone above posted, you're just in a bit of a snit. Take the L...