A person cannot change their ancestors nor the colour of their skin.

A person is entitled to freedom of religion and thought and sexuality(let's not get silly about this aspect, OK?).

People can change the level of their education, their speech habits, their written abilities, their manners, their diligence, etc. In short there is nothing to stop people seeking to improve themselves.

Some, however, would prefer to hang around on street corners, spit, fight, steal, and seek to mock those of better speech and behaviour. Since that is a matter of choice by those idiots, ridicule of them is not unjustified.