NUdists are sinners who are proud of their sick sin. They obey their sin nature, and try to force everyone to accept their sin or face the consequences
I have a sad story about nudism and a family member who was seduced into a creepy cult that used “fun, family-style nudism” on a ranch in Colorado to hook members. Come for the fun, clothes-free vacation - stay for the drug and human trafficking. Some other people I used to be tight with got mixed up in it too. It’s not like they were extremely nice, churchgoing types to begin with, but they weren’t brainwashed, suicidal nitwits to begin with, either - and now they are.
But stuff like this always makes me think of the Garden and the Fall - Gd got pretty upset with Adam and Eve for wearing clothes. Nudists always like to bring that up. “This is how I’m supposed to be!” (What do you think about that? Just curious. In catechism class when I was in school, the boys would always ask: “So, if I want for Gd to love me, I should stop wearing clothes?” to which the priest would typically reply with a tolerant little laugh.)
Outside the arena of sinfulness, nudity is a health and safety hazard, especially bicycling on city streets in traffic.