Matthew Poole and continuators on Genesis 43:32

32 And they set on for him by himself , and for them by themselves, and for the Egyptians which did eat with him, by themselves: because the Egyptians might not eat bread with the Hebrews, for that is an abomination unto the Egyptians .

Partly because the dignity of his place and the custom of Princes required this state: and partly for the reason here following.

Not so much from their pride and disdain of other people, as from their superstition and idolatry: partly because they worshipped the creatures, which the Hebrews and others did commonly eat: and partly because of some peculiar rites and customes which they had in the dressing and ordering of their diet. Whence Herodotus affirms, that the Egyptians would not use the pots nor knives of the Graecians about their food. Compare Gen. 46. 34. Exod. 8. 26.