Isn't most reputational damage very hard to conclusively prove for normal people?

If someone posts all over Twitter that I'm a fraudster and an asshole, and I feel like I'm having fewer prospective customers choose me to tile their bathroom and I'm getting fewer dates on Grindr - am I supposed to be able to prove that, and the causality in court?

Even if I somehow have detailed records of exactly how all of my dates have gone and how many prospective clients I've given quotes to - maybe there's just another tile guy who started asking for less, and I'm getting fewer dates because I got this garish pink mohawk.