You drive a Miata w/the top down in cold weather.
What's wrong with that? Doesn't sound particularly douchebaggish to me. I used to commute two hours daily in an open car (not a Miata - a much older roadster), and that included a New England winter. Even worse, it was an English car with no heat, and the wipers were so bad that I
had to keep the top down in freezing rain so that I could reach over the windshield to scrape the ice off while driving. Nuts, maybe, and impervious to pain, maybe, but I don't see the douchebag part. It was less painful than doing the same
schtick on a motorcycle.
Wearing a Budweiser T-shirt and a trucker hat when visiting the Vietnam memorial - now that would be the mark of a douchebag.