How many people actually get the movie reference without having to read an article about it?
vs.
How many people view the TikTok, get offended and cost Apple revenue?
It's not necessarily that he got 'canceled' for a movie quote. People get fired for doing innocent, but dumb things all of the time, eg. conduct unbecoming, and non-disparagement clauses. Doing something silly, stupid, crass, etc could be covered. The stupid thing in this case would be not realizing the controversy this would stir up. (what % of people would know it's a joke, etc.). Additionally, we don't know if he had any other 'strikes' on his record prior to this.