I dunno man.
In the 70s/80s, I don’t recall anyone having an issue with stuff like Mickey Rooney’s Mr Yunioshi in Breakfast at Tiffanys, and that was pretty fucking awful. I also recall a whole lot of ching-chonging and caricatured asian accents in high school hallways. You’ve got to remember we were just a generation removed from the ‘yellow peril’ propaganda of WWII that portrayed the Japanese as buck-toothed murderous sub-humans (and most Americans lacked the nuance to distinguish between Asian nationalities, yellow was yellow). I also remember ‘colored’ being the polite way to address black folks, before ‘negro’ took over in the 70s, then African-American in the 80s/90s, and now Black.
People whose education ended during or after high school, particularly those who live in insular small towns, are often completely oblivious to the shifting sands of the American lexicon, and simply use whatever terms were acceptable when they acquired their language skills. In truth, the shifting lexicon itself has become a class/status marker, which can only be kept up with by who are immersed in popular culture and/or have extensive exposure to academia. It’s become a way for upper class folks to instantly identify and ‘other’ working class folks.