Always worth being aware of the ultracrepidarians. The internet has changed the game.
https://en.m.wiktionary.org/wiki/ultracrepidarian
."In Book 35 of his Natural History, Pliny the Elder records that a shoemaker noted that one figure had the wrong number of straps on his crepida, a kind of elaborate sandal. Delighted to see it fixed the next day, he supposedly began to critique the form of the leg, so annoying Apelles that the painter came out to tell him to mind his own business: that a shoemaker should restrict his commentary to the shoes. This became a Latin proverb as ne suprā crepidam sūtor iūdicāret (“Let not the cobbler pass judgment beyond the shoes”)."
Ultracrepidarianism is more common than one might at first assume.
The Appelles geyser sounds quite shrewd. He would hide behind his paintings and listen to the criticisms.
No flies on that one.