I try not to engage, and it's not that I don't have foot in mouth disease sometimes myself, but I really had to bite my tongue recently at an idjit comment that just was so obvious they hadn't read or absorbed anything I'd written. They still had the confidence to make a creepy "helpful" suggestion as to how I could improve it. There should be a "fuckmuppet" button/emoji just to be able to wordlessly reply "Not today jerkwad". ;-)