What kind of proof would be sufficient to you for the claim “Elon Musk makes erratic and unpredictable decisions with his businesses”? Would a list of previous erratic decisions sway your mind?

Your “proof” is that Mr. Musk says so.

There is no proof outside of Musk’s statements that revenue has dropped since X no longer makes public their finances, and there is no proof that anything the ADL has done rises to legally actionable defamation. They have certainly mounted a boycott campaign, but that is not proof of defamation. Myriad other organizations have also called for boycotts. It is curious to me that you are so personally focused on the one boycott that Mr. Musk cited as the sole cause of the revenue drop.

I did link in another post a peer reviewed study from a third party showing that hate speech has measurably risen since Mr Musk’s takeover.

There certainly is a lot of correlation here, but all of us, including you, are speculating on the causality. You are leaning heavily on the statements of a single man who has a proven track record of being incorrect, to put it gently. We are leaning on a variety of other heuristics that can be summed up as “A known bullshiter has said something that sounds like bullshit, and makes no sense to our understanding and experience of the world.”

It will be virtually impossible since none of the "defamatory" claims fall under matters of (legal) fact. In fact, unless Elon really wants to burn more money, I doubt he ever files an actual lawsuit and this is all bluster. Then again I'd probably lose my shirt betting agains Elon doing foolish things.

elmu could wake up tomorrow and allege space aliens were trying to break into his brain, and the same group of sycophants would take his word for it as is now

for everyone else, he is an entitled, inherited-wealth internet troll with a history of lying

you don't see him filing his lawsuit against the ADL like he said he would, do you?

how about him stepping down as CEO of twitter like he said he would?

he's just an attention whore.