We lived in Africa for three years. The firmness of one’s stool is a common dinner topic among friends.
That’s my vote. 
If Egypt wasn’t your first overseas posting, you’d probably give off a well-practiced vibe that says “Been there; done that. Not a native, but also not a tourist.”
My ex-girlfriend is that way. She’s 5’2" and weighs about 50 kg, but she naturally gives the vibes of “Don’t you mess with me!”. And you better believe it, she once broke the nose of a guy who had harassed and insulted my sister. She’s a tough cookie.
I wouldn’t swim in the Nile.
Yeah, maybe Egypt is different. I just back from the UK (2 weeks) even the street vendors took Apple pay. Never handled money while I was there.