There is nothing wrong with a business giving extra "perks" to those customers willing to give more cash to the business. By your logic, should a grocery store give the same cut of meat to a customer paying for prime rib as the customer paying for ground hamburger? Or should a hotel room have the same amenities whether the customer paid $29/night or $299/night? Revolution! 🙄Constant reminders of caste, in a supposedly casteless society, will always bring on revolution.
Rather than emphasizing the difference, why don't you try to minimize the difference, assuming you are a crewmember?
You want the perks, pony up the fare. "Caste" implies a socio-economic class that one is born into, with no hope of changing no matter what one achieves in life. By contrast, in our system, one is (relatively) free to choose a career path to generate the income one thinks one deserves, and then with airline "classes," one is free to choose to spend that money to fly F and become a part of the F "caste."