Well, let’s see now, Mayor…
In 1946, there was no black players in the National League, so by your logic, Stan Musial’s .365 batting average is invalid. Fast forward 10 years. By now, the NAtional League has lots of hard-throwing black pitchers to strike Stan out, lots of speedy black outfielders to run down his fly balls, so naturally his batting averaged plummeted… all the way down to .351 !
In 1947, when there were no black players in the A.L., Ted WIlliams batted .343- but of course, using Mayor’s logic, Ted couldn’t possibly have done that well if he’d had to face black competitors! So, his 1957 batting average (.388!) must’ve been a typo.
In 1947, when there was just one black player in the N.L., Warren Spahn won 21 games. But of course, he couldn’t POSSIBLY have won so many games if he’d had to face black sluggers. And sure enough, 16 years later, when the N.L. had dozens of top black hitters, Spahn DIDN’T win 21 games- he won 23!
See a trend? The top white players’ stats didn’t suffer a whit due to integration!
Segregation was evil, pure and simple. Fact remains, the best players of any color play up to the level of the competition. Ted Williams, Warren Spahn, and Stan Musial adjusted to new conditions without missing a beat. There’s no compelling reason to suppose Babe Ruth or Joe Dimaggio wouldn’t have done the same.