dumb shaming

Using well-founded evidence in a public forum to point out the titanic and obvious stupidity exhibited by someone being, at best, a half-wit about something of which they know little or nothing.

Unlike “fat shaming” dumb shaming has less of a perjorative edge for the accuser than the accused, as unlike fat shaming, the person being a stupid fuck-knuckle is in a perfectly good position to not act that way.