At least the airplane clapping could be seen as cheering on the pilot for doing a good job. Much worse, imo, is the movie theater clapper. Those actors, directors and crew can’t hear your claps. They mean nothing!
As a teen most of my summer hollidays were spent visting abuela and abuelo in spain. Cinema (double features) were around 100 Pesetas (compared to Euro, w/o inflation 50 Cents(!). As you can imagine I saw every movie (rated or not).
First time was a culture shock (compared to the mostly silent German cinema audience), as they not only clapped, they also cheered or booed at any time the hero or villain did something heroesque/villainous.
But I grew into it and am missing it really. I wish this would be a thing everywhere.
Edit: I want to add that I’m an ancient person and ask any Spaniards: Is this still a thing?
That sounds incredibly fun as long as you’re expecting it
I mean, it’s just a logic thing to do. At least we all laugh together, watching a funny scene. Why limit it to this one emotion?
At least laughing is usually involuntary.