He's saying that facebook feels entitled to my data, even if I'm not using their resources. Why shouldn't I, then, feel entitled to their resources without blocking ads?

Is that in their EULA?

No one is ever obligated to view ads. I'm not stealing from the billboard company because I keep my eyes on the road, and I'm not a bad person because I mute the television every five minutes when NBC runs ads for things I don't want during the Olympics.

The browser is our user agent. Facebook can serve whatever it wants, but we're under no contractual or moral obligation to look at it.

What makes you think that? I recall reading previous articles linked from HN on this very topic that Facebook most strongly values the network size they can use in marketing sales pitches (i.e. the print circulation equivalent, the "reach"), not the ad impressions specifically.