"Weird" works because it's vague. [View all]
It's fully open to interpretation, and almost anything can fit under that umbrella. It's even more effective if no examples are provided, leaving it entirely up to the voters' imagination.
The GOP figured out a long time ago that vague accusations can be some of the most difficult to counter, especially in terms that defy easy definition. Liberal, leftist, inclusive, diverse, etc. They managed to make all of them slurs even though there's nothing inherently wrong with any of them. The "wrong" often exists only in one's mind.
Trump also hates to be mocked, and there's little he can do to counter the accusation. In part, of course, because he's undeniably weird.
I find it funny that a seemingly effective tool seems to have emerged from nowhere. It's like things that go viral -- no one can easily predict what will work and what won't. Sometimes, the best are happy accidents.
(Yes, that's a hat-tip to Bob Ross. 
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