I can't see any logic in this inference at all. "Snakes on a Plane" would certainly not be my cup of tea but I certainly wouldn't be so presumptuous as to assume that most or all those who saw and/or liked it were necessarily stupid or that it indicated some overwhelming stupidity in people generally. Those that would might want to see this.a) A film with a premis like “Snake on a Plane” ever got to production and
b) People went to see it.
If the human race is that stupid