When there's someone behind me with their brights on, i roll down the window and hold my palm over my left mirror so they can see me blocking the light (it has never worked)
I always try but I don't think the side ones move that far, and the center mirror has that auto darken thing and rear window is tinted so it's not that bright
I think in china they have these scary images on backwindows that shine when lights reflect in there for highbeam users