1. Welcome to the forum!
2. I had never driven a BMW until I test drove the E90, and also considered BMW drivers to be "snots", those gel-haired prima donnas that cut in line a merge lanes and so forth.
3. Bought one (okay two) anyway, and love the car. Really, I think most people's reaction to you on the road will be in response to your actions. If you're a courteous driver then most of the time you'll be fine.
4. Vandalism is another story, and obviously BMWs are targets because of the feelings of jealousy that cause some people to act that way.
In the end, I still love driving one!
P.S. So, take a shower already.