I agree this was out of line. How did the employee know where the glasses came from in the 1st place? For all we know, they already had these glasses before they even entered the park. Where they couldve gotten them from originally, that's another story. The more appropriate thing to do would've been to ask "Say, where'd you get those cool glasses?" If they did in fact incrimintae themselves by saying "From Star Tours", or from whatever ride from the park, than yes, than they would be able to say "They need to go back to that attraction." But unless the employee actually witness them taking the glasses, or they admit it, they shouldnt say a word.
When I wear 3D glasses, when not using them I just put them on top of my head. 1 time I forgot & walked out of T2 3D with them still on my head, & a TM approached me & said "Are those 3D glasses? If they are, you shouldnt have them on your head like that as it magnifies the suns radiation & you can burn your head." I dont even remember if she even asked for them or if I gave them back, but either way I didnt feel like I was being interrogated or accused of anything or anything like that, I felt more like she was concerned about my head more than she was concerned about the glasses.