OP is conflating morality and ideology. There are certain moral principles that can't really change and hold true in any society...things like harmony, being happy, honesty, knowledge, caring, love. Morality comes from people, sure, but I don't think that makes it relative by definition. It develops out of wisdom which develops out of understanding and reflection. It's not something you can deduce logically and prove experimentally, but it's still very real and universal.
Our dedication to those morals can change, and does change, constantly. We're seeing a shift away from moral virtues and towards materialism and nationalism/tribalism. It's not new, but it seems to have picked up steam in the last few decades, probably due to globalization, the internet, but mainly rich people getting richer and devising better schemes to grow their wealth. It also looks like civil rights are being broadened and eroded at the same time. Russia, Islamist countries, and China and curtailing civil rights and abandoning basic moral principles to consolidate power, while European countries are trying to incorporate these moral principles into their health care and financial systems. As far as the US goes, hard to tell but I think it's moving in the direction of great civil rights and ethics, ultimately.