Does the answer matter to you in any real sense? Will you happily lie down and let yourself get abused for life because someone convinces you that "entitlement is objective or subjective"?
Being entitled to something means having a just claim to it. "Just" refers to something being morally good, which comes down to your system of values. Personally, I don't think values are subjective at the root.
But in the end who gives a fuck, the people of our society claim to care about equality and even equity in most other contexts. That they don't in our case has nothing to do with them thinking "people aren't entitled to being treated equally and fairly", it's down to us being part of the out-group.