I guarantee there were plenty of Asian Americans back then that did care. Same with Indigenous Peoples when they saw someone non-native 'dressed up' as one of them on countless tv shows and movies. Black Face went over well for the white audiences before that. I'm sure people of African descent didn't care for that at all. So when I read your sentence of "They just didn't care at all back then" I interpret 'they' as white people, the powers that be, etc...Non-white folks did care. There's a quick and powerful scene at the beginning of Dragon: The Bruce Lee Story. Lee is on a date with future wife Linda and they are watching Breakfast At Tiffany's, a Hollywood classic. I'm sure the general white audience found this particular clip funny and at the very least not objectionable. But to someone different.... https://criticalmediaproject.org/dragon-the-bruce-lee-story-breakfast-at-tiffanys/ I agree with your top portion about not getting any pushback back then but we also have to understand that issue within historical/cultural context of racial dynamics. Non-white folks barely had any voice back then.