Angry Mercedes C230?

Yesterday I encountered my first really negative reaction towards my M3. I just thought it would be a nice story to share with everyone. I was trying to merge onto the highway, which was no problem. After merging I decided to change lanes towards the middle lane, so I downshifted, RPMs going higher. After I change lanes, a C230 does a flyby in the leftmost lane a couple of seconds later, making sure I see and hear his modified exhaust, all the while having the passenger stick out his hand giving me a thumbs down. And boy did that passenger want to show me his disapproval. That really left me wondering if I did something wrong. I surely didn't cut him off since when I switched lanes and there wasn't anyone there. I moved over slowly too. I guess hearing my engine noise makes him feel immature enough to feel threatened? I guess haters can hate.

I also felt that there really was no reason for me to catch up to him and give him the middle finger or shout some expletives. What good would that have done? I have the most to lose with a brand new car, and my life or the life of others surely isn't worth some momentary retribution or glory. And besides, the M3 is clearly faster. Honestly it was kind of funny, so I just laughed it off. Makes a great story to tell later on right? Drive safely everyone!