Honestly he could be a self hater but a few outfits in Dubai don't prove it. I noticed at his brothers wedding he was the only one out of the three that wore this over the top Asian outfit that guys don't usually wear.
He likes to dress up...thats what I gather from these outfits and he probably got gifted some of these to wear when he got there.
I don't know what the situation is like in the UK but in the US Indians never claim to be Arab. Maybe because the Arabs in London are the rich Saudi types while the ones in the US are poorer refugee types from Iraq and Syria.
I have noticed that amongst UK Asians. They think they have made it when they marry a (very average) white girl.
His dad and his brother are wearing regular suits and then there's Umar.