Most modern "liberal" philosophy is oriented around non-discrimination and non-judgement as the ultimate, unquestioned values, which basically negates thought (which is instrinsically judgemental), and ultimately necessitates the falsification of reality. (That's why you get, for example, the silly argument, so common with the Left generally and the PC cult in particular, that if someone isn't doing as well as someone else, it must
necessarily be because they're being exploited or oppressed or discriminated against - the presumption being that without the hypothesized "systemic" discriminatory or exploitative social relations, everyone would do equally as well, which is of course absolute nonsense.)
People are better at things than others (including "being a better person" morally), and some people are better at a lot of things than others. Some races and ethnic groups are also better than others at this or that, on average. However, that doesn't necessarily have any dire implications because comparative advantage is a thing. (i.e., even if you were better at
everything than anyone else, it would still pay you and everyone else, to delegate the things you're less good at to others - even if they're less good at those things than you are - so you can focus time and energy on the thing you're super-best at.)
There's a higher level of abstraction at which the similarities between human beings outweigh the differences, though (i.e. everyone who is at least basically competent is equally a self-steering agent), in which case saying someone is "better" than others
tout court is a bit off.
It's a question of perspective. While the difference between the capabilities and potential of a janitor and the capabilities and potential of a CEO matters a lot in the
human world, in the full context of the
natural world, both share a huge amount of functionality and a whole raft of amazing capabilities that we take for granted (e.g. the ability to walk, a difficult task, as robotics people like Boston Dynamics found out, though they are obviously cracking it); while the differences in genes and brain structure, etc., that make such a huge difference in the human world are in fact usually relatively small, the tip of the iceberg, in relation to that shared mass that's roughly equal. No doubt if you were Ant-Man you'd learn to recognize individual ants, but from the point of view of an ordinary human, they all look the same. Similarly, the janitor and CEO are close enough for jazz if you zoom out and treat the tiny differences as noise.
And at the highest, "spiritual" level, in most religions and systems of mysticism, all sentient creatures necessarily have a sort of equal dignity in being emissaries, or miniatures (microcosms) or "sparks" of the Absolute, God or whatever you want to call the hypothesized underlying Engine of the mystery of existence.