I'm an ATGATT guy, and it's great to see so many others on this board. Over my jacket, I also wear a hi-viz vest (cheap from Harbor Freight, but it's held up well!). I get laughed at on occasion, and I get a lot of smirks from people in cars. I also have noticed a decrease in bikers that wave at me when I'm all geared up with my modulator flashing (in my last bike - going to install the FZ6's modulator soon)! This could just be my imagination.
As others have said, I almost enjoy being laughed at. I know that I'm doing what I can to reduce the risk of injury. I hope those that wear no gear (or only a little gear) never feel the consequences of these decisions.
To me, too, it's a family thing. I care enough about my family that I don't want them to have to bury me because I enjoyed the "air in my hair". If the unthinkable were to happen, I want my family to know I cared about them enough to do everything I could to prevent the tragedy.