I have not read the replies yet, only the topic. Morality absolutely IS relative. TORAH morality is not, however, and is absolute and for all time. Once upon a time it was considered immoral for two men to be a couple. Now, given the relative morality of the times, there are people who believe it is immoral for them to NOT be allowed to be a married couple.
Only a Torah-observant Jew or Noachide-law observant non-Jew is empirically (did I use that correctly?) moral. Everyone else does what they THINK is morally correct, subject to the times in which they live, and of course what one person thinks is correct, ain’t necessarily so.