secondary mirror tinted mode.. 
Its angle reflecting your rear window so in real , u cant see.. u
are seeing another reflection.
Some cars they either purposely or not , they adjust the headlights
higher. So even in normal it feels like high beam. Only solution is
flip the rear mirror downwards. Thats what the flip is for.
Or u just pull over let him pas n then u high beam him all the way.
Even better if he goes to dark places with no lights.. ur high beam
will blind him even if he flips it down..cause his side mirrors are
still angled at his eyes . unless his car supra tint . One of the reason why my
rear screens are way darker then the front.
