Not sure why it triggers people? Do the same people get annoyed when folk wear trousers in summer?
Same, let people wear what they like, who cares? Do they whinge about women wearing skirts or dresses on their Christmas night out?
I draw the line at people wearing pyjamas out mind, who blatantly slept in them, and wear slippers which clearly are not practical for even a one-minute walk through a car park.
I spend most of my day in shorts working from home, if I expect I don't have to go out for anything like any meetings or whatever. But if I end up needing to go to Tesco or the Post Office there's no way I'm getting changed again, and then again when I get back, I'd just go in shorts. I likely won't die and the 30 seconds walk from the car isn't much to worry about, not compared to playing sport on a weekend in shorts and t-shirt :/
Alternative thinking is maybe us cycling folk are just a bit more hardened to the elements?
On the other side of the spectrum, a golf course I used to play at was practically insistent on Trousers, even in summer, at midday, which is absolutely bonkers, especially on a hilly course, or carrying/ pushing clubs. Of course, they always claimed they had an option for shorts, but the effective design to meet their criteria was practically as bad as trousers, and also had to wear knee-high socks. Absolutely backwards. It came back and bit them in the **** as (like most courses) they started to drop members like flies, especially younger folk who have zero interest in golf "tradition/ etiquette". They eventually realised the member drop, and with it came the more relaxed clothing requirements, was too late by then and it's now a housing estate. It is still daft that sportswear isn't allowed on most golf courses mind.