Ever since China took over Tibet in 1950, the PRC government has been systematically settling Han-Chinese there, in a clear (and apparently successful) effort to make it a Han-majority region and thereby forestall nationalistic secessionism.* The Dalai Lama is on record as not liking that.
In this thread, particularly this post and this post, Chen019 posits equivalence (and implies equivalent legitimacy) between the Dalai Lama in the above respect, and white Americans who want a racially discriminatory immigration policy (such as the U.S. actually had, from 1924 to 1965) for the purpose of preserving America’s character as a white-majority country.
Now, I’m not at all concerned with defending the Dalai Lama’s POV here, I’m rather uncomfortable with ethnic nationalism in any form, but where’s the equivalency here? The Lama just wants Tibet to remain Tibet, which it might not if Han colonists overwhelm it; whereas nonwhite immigrants pose no threat at all to America remaining America. We have absorbed countless immigration waves in the past; and in the process our national culture has continually altered but still remained the same, as living organisms tend to do over time.
*(Saddam Hussein did the same, BTW, with the traditionally Kurdish cities of Mosul and Kirkuk, which he still controlled between the Gulf War and the Iraq War – he colonized them with ethnic Arabs, who then, after 2003, had to face ethnic cleansing by returning Kurds. I’m not defending either side, there.)