People do realize the reason Shatner's "Khan!" scream is remembered is because most people think it's funny. Seriously, how much mileage have comedians and sitcoms gotten out of it in the last thirty years?
Most people don't consider it some dramatic moment that rivals the best other movies have to offer. It's remembered because Shatner is a ham and the scream was right up his alley.
Exactly. If you go back to before STiD premiered, you can find post after post making fun of how cheezy and ridiculous (and embarrassing) Shatner's Khan scream was. It was a trope, whenever someone wanted to look silly (or have a reaction to indicate someone else's post was ridiculous), they would post a Youtube video of Shatner's Khan scream
It wasn't until after the movie premiered that all of a sudden Shatner's Khan scream was considered sacred ground and Dramatic Theatrical Excellence.
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?