My gelding attempts to dig his way to china whenever he eats. To be honest, his grubbing time is his personal time, so I leave him to it... I wouldnt want somebody hovering over me while I eat (although with 2 small kids.....). I could try and correct him, but it would require me standing beside him everytime he grubbed. He isn't hurting anybody (except the floor) and a feed pot in a tire works well enough for him.. but at 17 he's figured out how to paw without kickin his dinner all over the place.
Stop for a minute, open your mind, learn. You may not agree with what I say, I may not agree with what you say but we will both learn something new.