that's my experience, as a student, and especially as a teacher...not "wealthy", since wealthy people don't even work, let alone get degrees to teach, but certainly from relatively privileged backgrounds that guaranteed professional, or near professional class education and employment...
in my union and in academic senate activities over several years, i encountered only one other teacher with whom i shared a working class background...and she was also a part-timer...
that's anecdotal, but i would be surprised, and suspicious, of any study that revealed otherwise...teachers are the lowest of the professional classes, but they are way ahead of working class folks, and those teachers who come from working class backgrounds are in - usually - elementary , grade and high schools , and even community colleges have a higher proportion of "academics" who are from middle and near upper middle class background...when it gets to those of a left persuasion ( and few there) it seems even more so...
that doesn't mean they can't get across to their own class, but it can make it difficult to "teach" people with whom you share little , if any, common experience when it comes to economic and social background..not impossible, but difficult, sometimes very , very...
of course, this is the larger problem of the political and economic class that is progressive, at least psychologically, and wants to lead those with and for whom it has little, if any, common ground or even, in many cases, respect, to a better world....
fs