That word was not an accident. Because he used it more than once to hammer it in:
“I frankly just think it’s hysterical how much the media is overreacting to it,” Vance said while traveling to a campaign rally in Arizona.
…
“So what he said, I thought it was hysterical. I think he pointed out the fundamental chameleon-like nature of Kamala Harris,” Vance said. “She’s flip flopped on every issue. She’s fake. She’s phony. And I think our whole campaign is going to have a very fun time pointing that out. And it sounds like the president kicked us off in stride.”
For those unaware: https://en.wikipedia.org/wiki/Hysteria
The Appalachian hillbilly from suburban Ohio knows what that word means. He went to Yale.
Yeah I know where hysteria comes fine. But there is also a pejorative form of hysterical (in hysterics) and’s non-pejorative (hilarious, which is what I actually meant to have typed above to avoid confusion, but my brain went in autopilot).