This is interesting, but I offer an anecdotal counterpoint. My family has several cars and have had various makes and models over the years, including German, Japanese, and American makes. Often we have a mix in the stable at the same time.
My personal driving style does not change from one vehicle to another. However, I have found, more often than not, that other “aggressive drivers” on the road tend to try to exact some sort of revenge or personal vendetta toward any car that might be perceived as more “luxurious” or sporty such as the German makes. Whether that is cutting you off, tailgating, etc, certain people just take umbrage toward others driving to be what they perceive to be a snobbish make or model. That leads to being in some more dangerous situations when driving vehicles of that ilk.