The one that really was racist was LBJ calling them n word or other racial dergoraty
I don’t think Bush 41 or 43 had racist bone in their bodies
Neither President Reagan
Bush came from much more comfortable circumstances and went to college after the War, when prosperity was coming back, so the anger and bitterness weren't there. Reagan came up from poverty, but he also didn't have the kind of resentment that Nixon had.
I suspect you probably would have heard a lot of foul language and ethnic slurs if you could have listened in at the Johnson (or even the Kennedy) White House. The Kennedys were born rich, but like Nixon, they always wanted to appear tougher than they actually were.
To be fair to LBJ, though, that famous n-word conversation happened when he was trying to get men he assumed were racist themselves to go along with some measure of integration, so it's not necessarily the most representative comment.