Hold on there. Ads popping up on YT are annoying but it's up to the user to decide if they are worth the content they're watching, same as TV or print or the radio. Using an Ad blocker in my view is no different than stealing.
Not using a piece of a service (the ads) is not stealing, nor likely is it violating any service contact.
How do you react?
1. Tell me to go to hell.
2. Try to figure out a way to eat the cake without getting your thumb smashed.
3. Accept the offer.
1 & 2 are perfectly rational human reactions. 3 probably indicates some degree of mental illness on your part.
There's also probably a deep sickness in the society and culture that allowed me to make the offer in the first place.
is switching channels or otherwise ignoring the TV while ads are on also stealing?