This isn’t the same thing. Some people are happy with viewing ads in general, but are not happy with aggressive pop-ups that tell them to upgrad. In essence these alerts are saying their choice is the wrong one, even though it’s a choice that YouTube itself gave them.
More specifically: "good" ads aren't modal and don't force you to click through to continue. If YouTube just mixed YouTube Red ads in with all their other ads, I doubt that anyone would be complaining. (Except for the people who want everything to be free without any ads.)