I have a phrase, it is quite useful: "Can I get that in Email?" If the answer is "no", then I assume I am free to ignore that request.
... And if they ever try to "Get" you, you play dumb, "I don't recall".
Doesn't matter. The boss can still fire you - or lay you off.
The other thing I find useful is sending an email with a "brief summary" of whatever meeting it was. If they don't respond, then that is tacit acknowledgement the summary is accurate, and it becomes official record. Any non-written "clarification" would be followed up with same.
Still doesn't matter. The boss can still say he followed up in-person or by phone. The lack of a further email summary won't matter to his boss.
The problem is, far too many people find sleazy as an acceptable practice in organizations, and actively participate in the sleaze.
Don't participate and you have nothing to worry about.
Unfortunately, no. Too many people will believe the sleeze-balls.