My take: he’s generally opposed to this kind of laborious activism and tedious “political correctness” (broadly defined). He’s had some folks on his podcast who are very outspoken on certain things (trans issues, politics, etc) that people find offensive, and they claim he’s a “gateway to the alt right” as a result. Despite Rogan self-identifying as a progressive, the label has pretty much stuck and even though he has an extremely wide variety of guests - from cutting edge technologists to comedians to Snowden - on the show, he’s forever tainted by not aligning to the activists’ goals.
My personal opinion is that they don’t like him because his platform is massive and threatens other traditional means of informing people about what to think on certain topics.
> liberals care far more about proper culture signaling than they do about the much harder and more consequential work of actual politics.
I'd argue this is more about the political climate in the US (and many other places) than about liberals specifically. Arguably for "true liberals" this shouldn't be a consideration at all but might be for conservatives.
My personal opinion is that they don’t like him because his platform is massive and threatens other traditional means of informing people about what to think on certain topics.