it CAN cause you to have a headache if someone has one of those things on in a closed space, like a dark attraction. it's one thing if they want to wear them outside in the parks, but if you are seated behind someone wearing one, you don't have the option to "look away" like you do with someone just wearing one touring the park.
How exactly do you not have the option to just look away just because you're indoors? Eyes and neck muscles fail to operate indoors?