You're right, and it's not only Asians who notice this.
Here are some interesting comments by a black guy on another forum (username "K R"):
Its England, they've never hated anyone more than an asian.
and:
I always assumed it was a religious and cultural thing. On that front the white community is much more comfortable with the black as many black people are christian and raised under western values and culture - so on a basic level they get them more. Interesting thing is the hate seems to transcend even the ignorance and cultural under-exposure of working class whites into the more knowledgeable middle-class whites. A good amount of my friends are white middle class and the subtle, 'humouring' racism against the desi community is profound.
Also white and black people in Britain mix relationship wise about 10x more so I just think there's a kind of indifference there.
http://forums.ratedesi.com/showthread.php?t=287788
This guys friends sound like the closet racists you speak about. I wouldn't be surprised if they try to cultivate hostility in blacks towards Asians.
I think the same. A while ago I read about a half-Sikh / half-white guy who joined the army who was continually verbally and physically attacked by a racist corporal and ended up with his eyeball hanging out after one attack. But this kind of thing is predictable. Sikhs should do as Hindus and Chinese do and focus on good education and employment.