Tim Walz offers a model of masculinity that is easygoing and joyful, instead of the angry and bitter one Trump and MAGA speak to.
And it's making them nuts. So nuts that they think "gross, he cares about women" is a fruitful line of attack.
https://www.salon.com/2024/08/08/tim-walzs-normal-energy-is-causing-maga-to-come-unglued/