It's really not that at all. It's a very one-sided talking point, if you're hearing it a lot that simply demonstrates which media bubble you're in.
Search for the phrase "unelected judges": the results are all right-wing sources, literally starting with the Heritage foundation and Daniel Horowitz.
Over here in my media bubble I'm hearing a lot of complaints about judges who borderline perjured themselves in their confirmation hearings, "activist judges" (also a Republican talking point, now being used by Democrats to point out the hypocrisy of that talking point being used when the Heritage Foundation exists), "theocrats", and "destroying stare decisis".
"Unelected" doesn't enter into it, because of course judges shouldn't be elected, the whole point of the judicial system was supposed to be for them to be insulated from politics and focus on the law.
Yes, thank you for demonstrating precisely my point!
The results are r/shitliberalssay, r/conservative, multiple quotes from FOX News, r/roevwadecelebration, r/conservative, r/deplatformed_ (a pro-Trump QAnon crank) and Donald Trump himself.... One single story using the phrase in reference to the Dobbs decision was posted to a handful of leftwing subreddits seven months ago; otherwise it's almost exclusively right-wingers using the phrase.
For example, I am hearing a awful lot of complaints about un-elected judges this week.