I agree with your points. I don't think Somalis can really afford to be so excessively proud of themselves when their country is in such a state - it would make far more sense to have some humility for the people they live among when they immigrate to the West or the Gulf countries or wherever. Right now we're just arrogant.
That's an interesting question. Firstly, let's discuss how much of a problem "Black unity" would be under white supremacy.
First, what benefits do you think a unified 'Black people' would offer to both Black Americans/British and immigrants from Africa alike? Do you think a unified sense of identity would benefit them (and us) greatly? I just want to know what you think about this.
In regards to your question, I don't think that the fact that we weren't enslaved is the only reason that Somalis viewed themselves as superior to Bantus and black Africans alike. The fact that Somalis are ethnically, physically and culturally very distinct from them plays a large part in this too, and this would lend itself to stereotypes and insults that Somalis would have for said groups. But you could say that this was exacerbated by slavery, so your point still stands.
The Italian and British colonialists (two examples of the white nations you speak of) were aware of the racial hierarchy that existed in Somalia between the native Somalis and the Bantu slaves, and encouraged said superiority complex.
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(
Catherine Lowe Besteman, Unraveling Somalia: Race, Class, and the Legacy of Slavery)
I think that this reflects the attitude that Western nations would take today in regards to this inherent sense of superiority the Somalis have. In fact, they actually are aware of the divisions between Somalis and Sub-saharan Africans; the USA made the expatriation of Somali Bantu populations from Somalia a priority during the civil war (
http://cis.org/SomaliBantuRefugees) and the CIA even has a factbook on Somalia that explains clan dynamics and racial dynamics in Somalia (
http://www.cfr.org/somalia/somalias-clan-families/p13315). So I'd say Western nations are very much aware of the superiority Somalis feel (at least, the governments are). Unlike the colonial powers, however, they seem to be discouraging this by getting the discriminated groups out of Somalia and away from mistreatment.