I used to live with my Aunt and her family for study when I left school and my cousin who is 8 years younger than me sounded like a pig at at trough when he ate and it would make me almost physically ill to listen to it. I used to chip him about it all the time and my Aunt probably thought I was a bit OTT, but it was just foul to listen to it. Very rarely have I ever had to chip my kids about it.