Calling Trump "weird" is like calling Putin "weird". I mean, yeah, I guess technically you're correct, but it's a massive understatement at best, and at worst it focuses on the wrong things. People don't dislike Trump because he's weird. It's because he's dangerous.
It's a better strategy than labeling him dangerous. The latter would make his supporters go "Fuck yeah he is! Watch out libtards!"
The "weird" angle attacks his credibility.