A Magnus Archives Headcanon:

Gerard likes bad movies. Like, really bad movies. He’ll only enjoy a piece of media if it’s rated less than 30% on Rotten Tomatoes.

However, he has very prestigious opinions about these movies and will talk about them as if they’re refined cinema.

Bonus Headcanon From An AU Where Everything Is Fine:

Jon once got into conversation with him about movies without knowing this. When Gerard started talking about a movie he watched the night before with prestigious intensity, Jon assumed he was mentioning a critically acclaimed film he had never even heard of.

It made Jon feel a bit behind in his media consumption…so he tried to nod along with the conversation and pretend that he totally knew what Gerard was talking about. It was only when Jon went “Yes! And the…visuals were…magnificent.” that Gerard realized what was going on. It made him laugh HARD, but it took Jon awhile to emotionally recover from the the interaction. (Though, he was able to see the humor in it after time had healed some of the wounds to his ego.)