How do Buddhists separate caste system from itself when Gautama Buddha was so casteist?

There has been many questions on whether Gautama Buddha was casteist or not. The answer to that is, of course he was. Majjhima Nikaya > If, sometime or other, at the end of a long period, that fool comes back to the human state, it is into a low family that he is reborn - into a family of outcasts or hunters or bamboo-workers or cartwrights or scavengers - one that is poor with little to eat and drink, surviving with difficulty, where he scarcely finds food and clothing... AN 5.191 > In the past, brahman males mated only with brahman females and not with non-brahman females. At present, brahman males mate with brahman females and with non-brahman females. At present, male dogs mate only with female dogs and not with female non-dogs. This is the first ancient brahmanical tradition that is now observed among dogs but not among brahmans... Astasahasrika ch 25 > A Bodhisattva who trains thus is not reborn in the hells, nor among animals, nor in the realms of the Pretas, nor among the Asuras, nor in outlying districts [among barbarous populations], nor in the families of outcasts or fowlers, of hunters, fishermen or butchers, nor in the other low class families of that kind, in which one is addicted to low deeds It is pretty much established that yes, he was a casteist. Buddhism seems to regard him as Lord and often Infallible. Yet, most Buddhists doesn't seem to be too casteist. I am guessing the attitude towards caste changed. My question is, what changed this? Did you guys get influenced by Abrahamic religions or did you guys change by yourself? How do you separate yourselves from the stance that Gautama Buddha took? I asked Hindus how they are not casteist. Most of them responded they indeed believe in caste and justified it, while others simply said 'times are different'. When looked into Hindu history, we understand it was Abrahamic religions that made them change their stance. My question to you guys is what made Buddhists change? Or are Buddhists mostly secretly casteist too?