There's nothing wrong with complaining per se: the fault with snowflakes is that they complain about things that no rational person would complain about.
For example, different people must be treated differently in many situations - not necessarily better or worse, just differently.
There are significant differences in the way that people born and raised in some parts of the world think, feel and behave compared with people born and raised in other parts of the world. That's also true of people of different genders. It's also true of people who espouse different religions. It's also true of people from different social classes. It's also true of people from a great many other groups.
It is therefore perfectly appropriate to treat people from different groups differently in some circumstances.
Anybody who disagrees with the above is probably a snowflake and is most certainly an idiot.