I never had to deal with this since all the years I drove an M3 I was my own boss. Before that I drove nice cars and everyone knew I was a car nut.
Besides I don't care what others think ... The M3 is such versatile car most people see it as a BMW 3 Series only we and a few others know for sure
So follow other people's advice here in this thread ... Drive it, enjoy it, you work (or may have worked for it). So it's very simple you deserve it !
Others spend there money on other hobbies, bars mistresses whatever ... Who cares just enjoy what you worked for and have ... Safe travels ... Always