Yes saying it's the tint is ridiculous. Such a normal thing for a service department to do. Sometimes I think they think we are all stupid and accept their crazy theories.
So guys, try this look at the pic below of my door. Looking at this again, I think all models must have this cladding. See the piece that is slightly different blue (lighter) than the rest of the door at the very bottom where the weather strip stops, that is the cladding I'm talking about. If you grab that and lightly push out you'll see it moves slightly even if the metal color Allen key fastener you see in the picture is pretty tight. If it moves a lot my guess is you can probably put a couple turns on that fastener, but on mine even with that fully tightened, the bass in the music would still rattle this piece a lot. Mine didn't rattle with road imperfections that I could noticed, but it was very noticeable with any song that has some decent base. You'll see it rattle like crazy if you turn your stereo up with a bass heavy song. If you grab this cladding piece and hold it tight to the door, the vibration will go away.
What I did to quiet it was to put an insulator between the light blue plastic cladding and the metal door. If you loosen that fastener, you can then pull the cladding away from the door lightly (not hard or you may break the cladding) just enough to open a small gap between the cladding and the door. I used rubber insulating tape (you can actually see a little in the picture I pulled it out to show where I placed it for the pic). anything that will stay in there and insulate the door from the cladding will stop the vibration.
This is the main vibration that my doors were making with the music up. Doing this quieted them completely. I'm not sure if this is your issue, but it's worth checking.
the other thing I've heard is that someone found a bolt in one of their doors I believe. Maybe left there after assembly. If you move the door back and forth quickly and you hear metal rattling that could be it.
The other thing my doors did originally and I had the dealership fix is that there was a rattle coming from the mirrors. I had them tighten the mirror attachment bolts and that rattle went away.
Hopefully this will help.