I would never feel at ease being naked in public, all the more that temperatures are often not warm enough, that the sun can burn the skin, that many activities represent a risk for naked skin or require even protective clothing, etc., etc.
And rude behaviour, foul jokes, insults, wandering hands, etc. in crowded spaces, whether in the streets, in busses, trains, at events, in buildings and other sites, where most people wear decent clothing, are still too frequent.
On the other hand, why should I criticise those who feel comfortable with being nude?