"Weird" is a brand, not a description. The purpose and function of a brand is to take your mind to a description that is already in your mind, to refresh and restore it, like the brands "Apple" and "Disney" do. (I was taught this at Wharton.)
"Weird" takes your mind to Trump's nauseating ugliness. You're overthinking it if you ask questions like "then what are Democrats?" or "does that insult good weird people?" or "what does 'weird' mean?"
People who are more detached from politics but have negative impressions of Trump know exactly what Walz meant. They got it. Walz would have communicated *less* if he tried to say more.
Same thing when he articulated his position on abortion: "Mind your own damn business." No further explanation needed.