It’s a way to infantilize and ridicule the red team candidates that’s really hard for them to dismiss. They want to be perceived as strong, noble, divinely-appointed saviors of the morality of the country. Using ‘weird’ as an attack takes the wind out of their sails. And the only effective way to counter it is to embrace and transcend it, something the red team is incapable of doing.

From an article in WP

A central pillar of Trump’s campaign is the idea that liberals are perverted misfits who want to tear down American values. … [Trump supporters] were strong; libs were weak. They were right; libs were wrong…

“Weird” intrudes on that narrative. It doesn’t entirely upend it, but it does plant a seed of doubt. What if, instead of being admired or feared, they are instead being laughed at? What if, instead of edgelords, they are actually just the kids in the corner eating glue off their hands?

also

“He’s just a strange, weird dude,” newly-named vice presidential nominee Tim Walz (D) told an assembled group of 60,000 “White Dudes for Harris” at an online fundraiser last week. The Minnesota governor has been, if not the inventor of this tactic, its most skilled proponent.