Actually front view glare is 100 times worse, but the rearview vs. super high vehicles with LED lights is terrible also.
Read this all the way to final post... if want to try double tint on your rearview.
He tried this brand, and while it was a major PITA, he said it was worth it: https://www.vehiclewrapping.com/auto-window-tinting/kdx-anti-glare-mirror-film/
And funny comments here, maybe there will be a good idea:
https://www.reddit.com/r/fuckyourheadlights