You claim to know more than us.

I would love to be educated: when did I enter into an agreement with YouTube that I must watch ads to use their website?

YouTube is sueing me for damages. Their claim: I used their website but didn't watch the ads. (Maybe I used an ad blocker. Maybe I turned off my monitor and unplugged the speakers when the ads played. Maybe I walked away and let the ad play in a different room). What evidence do they submit in court to demonstrate I violated an agreement?

You've made quite a few comments across this thread, as have others that support your position. Not even within the YouTube TOS has anyone pointed out a contractual obligation to view ads. Not to mention YouTube doesn't require you to agree to their TOS to view videos.

With this in mind, it's perfectly understandable that someone could browse YouTube without any comprehension of something you seem totally confident on. I'm not being goofy here, I understand that YouTube wants me to view ads, I just genuinely am not aware of any contractual obligation to do so if I view videos.