I'm lost... are you trying to argue that it would be ok for naturalized citizens of a country to be forcibly removed from the country where they hold citizenship if that country decides that they're the "wrong" race? On what planet is that ok?
1. Whether that is OK or not is unrelated to the question of whether it is racist to revoke citizenship on non-racial grounds. Which it clearly is not. (The "...the wrong race" is purely you).
2. As far as I can see, the position that DHH referred to did not apply to naturalized citizens, but to foreigners. So non-citizens.
3. As far as I know, most countries currently have laws on the books that can result in citizenship being revoked. As an example, countries that don't allow dual citizenship will take your citizenship away if you become citizen of another country. Germany and many other countries will take your citizenship away if you lied on your application and it only comes out later. Terror and treason are also common reasons.
4. Some counties (India for example) will even take your (naturalized) citizenship away if you are out of country long enough.
