In my experience (on the employer side), you will terminated for performance, terminated at will, or at worst terminated for insubordination, but not terminated "for cause". Terminated for cause is very serious and generally means a serious breach of some sort: embezzlement, harassment, breach of contract, etc.
Termination of any of the other sorts is much less serious, usually results in severance and unemployment eligibility, and if you're coming from a place that mistreats its workers, it's generally not a hard story to sell that you stood up for yourself and got whacked for it. Other employers know the jackass employers by reputation, at least in the local area.
Terminated for insubordination is actually what I meant. I seem to recall that that was one of the "for cause" criterion, but not absolutely sure. Regardless, at the companies where I worked it meant involuntary termination without eligibility for rehire, no severance, and no unemployment benefits.
UI eligibility varies state by state. Here in MA, the FAQ says: "if your employer is able to show that you were fired for deliberate misconduct or violation of a company rule, you may be disqualified."
My strong wager is that standing up for abusive management practice would not trigger the "violation of company rule" clause and an employer with a penchant for acting like a jerk is unlikely to fight such a UI claim.
Sure, but the problem is that if the employer is really bad they will strongly deny any abusive behavior and insist the employee simply refused to follow reasonable orders. Does the employee have to sue to get that overturned, and how would they win if it is one person's word against another?
Termination of any of the other sorts is much less serious, usually results in severance and unemployment eligibility, and if you're coming from a place that mistreats its workers, it's generally not a hard story to sell that you stood up for yourself and got whacked for it. Other employers know the jackass employers by reputation, at least in the local area.