I don't have time to look through the other 216 comments at my time of reading 20.01.23.

I've travelled a lot, but not much compared to you. I've been to Egypt a couple of times.

It is not "naive" to trust strangers. It is stupid to make business transactions after the fact and with virtually no conditions. If you send someone for food you give him a budget. If your expectation is $5-10 for pita you tell him "I want pita and/or falafal max $10" and you get confirmation before he leaves. If he comes back with steak, you ask how much and he says $50, then you just say "that was not our agreement." You don't pay. End of story.

Yes, having people in your face is tough if you're not used to it. Having people haggle over everything is annoying for wealthy westerners (like we both are) for whom the amount makes no difference and with a different culture of negotiations.

Get over yourself. Do your research before you travel. You can get ripped of in Instanbul, Bukarest, Sofia, Prague, Brno, Bratislava, Split, Ljubljana, Udine, Budapest, and London, Paris, Berlin and Vienna... If you don't have any idea what things cost and don't speak the local language you can't expect strangers to give you what consider a good deal.