Herodotus offers a strange description: everything is the reversal of a custom that existed in Greece. The explanation is that the ancient Greeks believed that the barbarians on the edges of the earth were the opposite of the civilized people in the middle of the terrestrial disk. Herodotus' description tells a lot more about ancient Greece than about the Egyptians.
The story is offered here in the translation by Aubrey de Sélincourt.
[2.35] About Egypt I shall have a great deal to relate because of the number of remarkable things which the country contains, and because of the fact that more monuments which beggar description are to be found there than anywhere else in the world. That is reason enough for my dwelling on it at greater length. Not only is the Egyptian climate peculiar to their country, and the Nile different in its behavior from other rivers elsewhere, but the Egyptians themselves in their manners and customs seem to have reversed the ordinary practices of mankind.
For instance, women attend market and are employed in trade, while men stay at home and do the weaving. In weaving the normal way is to work the threads of the weft upwards, but the Egyptians work them downwards. Men in Egypt carry loads on their heads, women on their shoulders; women pass water standing up, men sitting down. To ease themselves they go indoors, but eat outside in the streets, on the theory that what is unseemly but necessary should be done in private, and what is not unseemly should be done openly.
No woman holds priestly office, either in the service of goddess or god; only men are priests in both cases. Sons are under no compulsion to support their parents if they do not wish to do so, but daughters must, whether they wish it or not. Elsewhere priests grow their hair long; in Egypt they shave their heads.
[2.36] In other nations the relatives of the deceased in time of mourning cut their hair, but the Egyptians, who shave at all other times, mark a death by letting the hair grow both on head and chin. They live with their animals - unlike the rest of the world, who live apart from them. Other men live on wheat and barley, but any Egyptian who does so is blamed for it, their bread being made from spelt, or Zea as some call it.
Dough they knead with their feet, but clay with their hands - and even handle dung. They practice circumcision, while men of other nations (except those who have learnt from Egypt) leave their private parts as nature made them. Men in Egypt have two garments each, women only one. The ordinary practice at sea is to make sheets fast to ring-bolts fitted outboard; the Egyptians fit them inboard. In writing or calculating, instead of going, like the Greeks, from left to right, the Egyptians go from right to left - and obstinately maintain that theirs is the dexterous method, ours being left-handed and awkward. They have two sorts of writing, the sacred and the common.