Not coming to this dude's defense, but I'm occasionally in buildings in sunglasses too. I've had to wear glasses my whole life and they're thick enough that I honestly can't see much at all without them. So, sometimes if I have my prescription sunglasses on it's much easier to just go inside with them on (if it's gonna be a short stint), than go find my regular glasses, put them on, then trade them back out moments later. Examples include getting paperwork after walk arounds, hitting the lav in a dark cabin when it's sunny in the cockpit, etc...

Maybe that makes me a tool. Hope not, but I often hear from people that think it's funny. Sorry folks, can't see without them.