I wouldn't mind paying for YouTube if its subscription cost was anywhere close to reasonable.
If you gave a shit, you wouldn't use YouTube.
Both you and the parent simply come up with reasons to avoid paying, getting the service for free.
No matter how you look at it, what you're doing is immoral, because if everyone did it, YouTube would be permanently paywalled and placed under DRM. You're a privileged individual that prefers to be subsidized by those that pay or that watch ads.
Expensive coffee at Starbucks which I would never buy. With $10 I can buy coffee for 3 months. It’s way too expensive for me.
I also consider every form of advertising to be brainwashing. Last but not least, I watch 1 YouTube video per month, so you would have to adapt your scenario for me to be interested in a subscription.
If there's a reasonably priced subscription available (or another business model), and if the publisher doesn't want your eyeballs while you have an adblocker active, there's no argument you can make for the morality of adblocking. It's your computer, you can be selective about what you execute on it, but the publisher should also be free to reject your visit.
Blocking YouTube's adblock detection legitimizes all the changes that Google is making in Chrome, being why we can't have nice things. And it's similar to extensions designed to workaround paywalls, or software piracy. Sooner or later adblocking will become illegal.