I'm not sure whether your confusion is genuine or feigned. If it's the former, then allow me to blow your mind by informing you that non-Californians exist and use the internet.

I live in Oregon.

It's not confusion so much as incredulity that this would seem disturbing to someone, especially considering it is so common that a major state[1] mandates it for some employees. California is an example that mandatory sexual harassment training is common.

I form my opinion about common practices in the US mostly based on internet stories (and they are often pretty wild!). Among my IRL friends no one ever attended a training like this.