Why do you describe them as pissed off? Simply because they use their rights to battle for better working benefits? This snide characterization of unionized labor undermines all workers' efforts at fair compensation.
I would describe the citizens of Flint, MI as "pissed off", and rightly so. Would you say that description is undermining their efforts to right past wrongs?
If I were you I would hesitate to make such hasty accusations.
If I were you I would be more careful with the connotations of the language you choose, being mindful of how it is likely to be perceived.
What about their employers?
I think unions are painted with a very broad stereotype by people who don't know them (including most people on HN, I would guess) and held to different standards than businesses, many of whom are notably corrupt.