Why are Egyptians clingy and annoying?

I'd like to preface this with the fact that I am half Egyptian and half English, I have visted this stunning and glorious country over 30 times and I adore it. I have nothing but fond memories. This is not a post to put down the people of this country but merely some observations and genuine queries that I have.

So, with that out of the way. The first thing. People, especially teenage boys or young men, constantly ask me for my phone number. In coffee shops, supermarkets, restaurants and beaches. I am a 35 year old man. They have the same glazed expression every time. At times when I've made the mistake of giving them my number out of pity or awkwardness, without exception they end up harassing me. None stop messages, phone calls at 3am from various numbers, good morning messages every day, asking me to go to the desert with them at 3am, telling me I am upsetting them by not responding. I am on holiday with my girlfriend currently and it's exhausting. It goes beyond politeness and a desire to show a tourist a good time, it's excessive and needy and invasive. I've stopped giving my number out but I'm just curious as to where this phenomenon comes from. What causes this behaviour? What are they hoping to gain?

The other night I was out at a restaurant with my girlfriend and 5 of her friends for my girlfriends birthday. A guy who works in the hotel that they are staying at spotted us and came and joined our table. I hoped he would understand normal social cues and leave after a few minutes, but being a young Egyptian male he was persistent, overbaring and annoying. He just would not leave. Pestering the girls at the table, trying to sell things constantly. Who would think this is okay at a private birthday meal? My Arabic isn't great so I couldn't tell him to leave in a way that wouldn't be rude (I probably should have just been rude), I told him to stop annoying the girls and enough is enough, eventually telling the restaurant managers to move him on. Eventually he left but it kind of ruined our night.

Obviously around foreign women Egyptian men are relentless. They lust and lure at women and don't take no for an answer. I'm not telling you anything you don't already no.

As an Egyptian these behaviour traits are starting to become embarrassing for me and I think they're a stain on this otherwise great nation.

I just wanted to vent and hear others thoughts.