Well, I'm not exactly white (surely not in the WASP sense, in fact KKK used to really dislike us), nor mob, and hardly come from any privileged background (dad was a low-pay commercial sailor, grandpa worked at the buffet at hotels), but yes.
Or perhaps it's HN working as always and people disagreeing?
A heavily downvoted post is not exactly a "mob" (any more than a heavily upvoted one would be).
People threatening or calling you names, or demanding your job, etc, would be a mob.
I also get lots of downvotes when my opinion is not popular (which is easy, I'm not very fond of what I consider the fads of the era, or mainstream opinions on most things). But I wouldn't call it a "mob" in ordinary HN cases.
