You most likely need to adjust your headlights if getting flashed is a common occurrence. They can come high from the factory, so even if you're not lifted it's possible. I don't remember the exact height, but I measured my friend's Ford Focus side mirrors and put my lights about 2" above that at 25 feet. That way I'm not blinding their rear view mirror, but they're still high enough that I can see. The Focus is a pretty normal sedan so I figured it'd work for most. I'd say most, if not all, of people's complaints about LED/HID lights are from people that don't adjust them. Here in the south we have so many idiots/kids that lift their trucks and never touch their headlights. If they're bright to ME in my truck, then they're bright to EVERYONE.
I only get flashed by super low cars, and that's their problem. My dad used to have a Toyota MR2 where your head sat at about 34" off the ground. Driving at night was a nightmare because even sedan lights blinded you, but that's the price you pay to drag your *** on the ground.