Muckracker
Definition: To search for and expose misconduct in public life.
In other words, houlier than thou moralist/SJW/Anti-Woke types trying to "expose" or "cancel" others, in this context. Obviously used as an insult, since I am spelling everything out.
This is also a slur often associated with journalists in general, especially in the 19th and 20th century, used by Teddy Roosevelt for instance. Not my problem that you're uneducated, buddy, I thought they taught kids about this in high school but maybe I'm wrong. Considering the intellect at work here, I should expect people involved in the whole grifter sphere to not have a good grasp on the English language, maybe if one of these grifting e-daddies liked using it you would pretend to know what it means.