I agree somewhat with you on the notion that you shouldn't judge a whole group of people based on the actions of a few (especially online)
But on the other hand I noticed that other groups don't even troll the way Somalis do
You don't see Asians, Latinos or even other black Africans invading AA forums bragging about shallow things such as having 'soft hair' or never being enslaved

And another thing you wont see is them trolling/bragging about these things to any other race of people.
To make matters worst, there's even West & South African peoples with the same features these somali trolls brag about, yet those West & South Africans have never tried instilling a superiority complex over the other Africans. Even lighter-skinned/mixed race AAs get along with the darker skinned just fine. (Sure there may have been the whole light-skin vs dark-skin thing in the AA online world, but trust me, for the most part we all get along )
Really makes ya think, doesn't it

Maybe it actually comes down to these people having low self-esteem. I mean, at the end of the day they are coming from a war-torn country as refugees while AAs have plently good things going for themsleves. I think they just want a little recognition.