We all want to live in a world where people are treated professionally.
So, please just step into that world. Expect others to do so as well. Hold those that behave abhorrently to account by all means, but take the high road.
(Not that I disagree at all! Serious question.)
Wrecking people's reputations and careers with mob justice is unacceptable. You must not burn situations with fire.
However it should be said that so many of these things are dependent on the people involved. I’ve never been accused of/(praised for) acting chivalrous in nearly 40 years on the planet. I suspect I can get away with things that people who open car doors can’t.
However I bet those people have plenty of tools at their disposal to make it clear that they aren’t defending anyone - but rather attacking poor behavior. I say they should act and use those tools, rather than not acting.