I think you pretty much have to dress super nice to pull off a scarf as a guy. And most of us can't. I see a few business folk in the winter in full suit jackets with scarves as well but I feel like that's actually to keep their neck warm. If you wanna run around as a ninja on Halloween or something that's definitely a legit use for a scarf lol
Women's scarves seem to all be about fasion rather than keeping warm.