Wheatley is apparently a Flat Earther as this is exactly the kind of logic/argument they use...
I guess this technically makes sense for him though, as he is from the Source engine, where the world essentially is actually flat and all constructions otherwise are actually but clever illusions.
Due to a very realistic dream I had as a kid that went through an entire day from waking up to going back to bed, in which I had learned how to fly that day, 8(ish) year old me legit got out of bed, went out to my back yard, and tried to fly some more for a good solid ten minutes before I finally, crushingly, decided it must have been a dream.
So yeah. I legit thought I could fly, and tried to fly. Still couldn't do it. Can't fly.