Avira > from a big lerusah
There is something here, yes, but there should be some limits. Whole sugya in Beitza revolves around eating raw meat on Yom Tov. Nobody is suggesting that yom tov seuda overrrides derech eretz min haTorah.
googling related varying manners: not talking during the meal – prohibited by Taanis 5b, Orach Chayim 170:1 but Prisha says this is due to old custom of eating reclined