I have found that such people are almost always the very thing they are trying to claim other people are. Almost like they are yelling at a mirror.
this is what Trump taught them to do through his own actions... Whenever he is sued (the past 1,000 claims against him and his companies), his team would preemptively sue for the same thing... it draws on the concept of "first reported is more right"... or, the "anchoring bias".
So, if you are spreading lies, be quick to accuse those you are lying about of lying themselves first. the key being FIRST.
It's the "I know you are but what am I"? tactic.