The Lebanese are a highly arrogant subset of levantines, who are highly full of themselves and larp as French bc they were a French colony once. A third of them are very light skinned like Syrians and they see all other Arabs beneath them. I know this because I was engaged to a white passing Lebanese man for three and a half years and lived in the middle east with various Arab communities for a few years while working. I basically know a lot of communities intimately. Egyptians do tend to be a bit loud and a bit too much but very friendly like the Philippines people. However, the Lebanese deem themselves superior.The Egyptian theory is a stretch. Especially given that these people's tend to marry within their communities. Evan Lebanese don't usually marry other Arabic ethnicities. The hive mind is already in place tho. Taxes are exactly that. We work for the better good of society (in theory).
Anyway, this is not a comment in bad faith, it’s an attempt at explaining facts. I actually like Lebanese people and their food, and Egyptians are friendly. They don’t intermarry because of actual cultural and slight ethnic differences.