They are a minority of voters, though. And they get to unilaterally declare things that the vast majority don't get to vote on. I don't think you're making a good case.
I don't think that particular example focuses on the right thing to make the comparison similar.
The point isn't that education (in general) can't happen during a strike or that you can't get groceries (in general) during the strike you mention. The point is that education union is a small minority controlling what education is available, regardless of what the public wants.
To make your analogy similar, I think you could compare to grocery workers refusing to allow meat to be sold in grocery stores because a large portion of them are vegans, regardless of what the general public wants.
Support for unions in the US is at record highs (~70%), well above a majority of voters. If you slice by age cohort, highest support is Gen Z, lowest support are oldest cohorts (Boomers, Silent), which are aging out ~2M/year (55+ age cohort) [1].
Interestingly and very recently (December 11th, 2025), the US House recently voted on a bill to restore collective bargaining rights for a majority of federal employees [2]. House lawmakers voted 231-195 to pass the Protect America’s Workforce Act [3]. The entire Democratic Caucus, along with 20 Republicans, voted in favor of the legislation.