Your question is an important one, but also one that has been extensively researched, documented and improved upon. Whole fields of science, like "Metaethics" deal with answering your question. Other fields of science with defining "normative ethics" aka ethics that "everyone agrees upon" and so on.
I may have misread your question as a somewhat dismissive sarcastic take or as a "Ethics are nonsense, because of who defines them". So I tried to answer it as an honest question. ;)
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People and societies.
Your question is an important one, but also one that has been extensively researched, documented and improved upon. Whole fields of science, like "Metaethics" deal with answering your question. Other fields of science with defining "normative ethics" aka ethics that "everyone agrees upon" and so on.
I may have misread your question as a somewhat dismissive sarcastic take or as a "Ethics are nonsense, because of who defines them". So I tried to answer it as an honest question. ;)