While I personally agree that the tail stripe won’t look good with the side moldings, this is a lousy reason to not do it.
Who cares if people talk behind your back? It’s your car, do whatever you want. If I worried about “people talking” I couldn’t have done most of the biggest improvements to the handling of my car. Which is what I wanted, not a bunch of happy purists that I don’t know and don’t care to.
Don’t build your car to please anybody else. Build the car you want. If that means putting a stripe on it that it wouldn’t have had from the factory, rock on. If other people don’t like it, they can buy their own car and do it different.