Republicans won't even mention white people.

They have dogwhistles, which are the same thing.

In fact, a very certain U.S President explicitly mentions why they don't say "white"

Nixon's advisers recognized that they could not appeal directly to voters on issues of white supremacy or racism. White House Chief of Staff H. R. Haldeman noted that Nixon "emphasized that you have to face the fact that the whole problem is really the blacks. The key is to devise a system that recognized this while not appearing to".[46] With the aid of Harry Dent and South Carolina Senator Strom Thurmond, who had switched to the Republican Party in 1964, Nixon ran his 1968 campaign on states' rights and "law and order". Liberal Northern Democrats accused Nixon of pandering to Southern whites, especially with regard to his "states' rights" and "law and order" positions, which were widely understood by black leaders to symbolize Southern resistance to civil rights.[47] This tactic was described in 2007 by David Greenberg in Slate as "dog-whistle politics".[48] According to an article in The American Conservative, Nixon adviser and speechwriter Pat Buchanan disputed this characterization.[49]

https://en.wikipedia.org/wiki/Southern_strategy#Roots_(1963%E2%80%931972)

That's because Democrat/Republican is kayfabe.

They're both terrible, but the Republican strategy of calling non-white countries shitholes or Mexicans as rapists come across as political suicide. Just think. If they're bad at attracting Whites to their party, why go 2x harder and scare off most non-white voters in the process? They should have just swallowed their pride and form their own multicult party that can at least push a social conservative agenda.