Remember Google memo guy James Damore? Labor Relations Board just rejected his discrimination claim. Employees can express opinions and businesses have to ensure non-hostile workplaces. Damore's memo brought these into conflict. Therefore Google was within its rights to fire him.
Fair point. But there might be no way around it. “Hostile work environment” is hard, if not impossible, to identify without some element of subjectivity, which is inherently fluid, at least in part.