A lot of morality is of course fashion (and "relative", if you want).
But failure to articulate universal moral rules concisely, doesn't mean there's no concensus.
Circumstances and relevant context can be very complicated and laborious to describe, but there are still many cases where overwhelming majority of people would agree on what's right and what's wrong.
But morality claims to define right and wrong based on logic not consensus.
Consensus changes and is also often confused with "acceptance" like for example a majority of people accepts some kind of legal abortions that doesn't mean they think it is morally right to do it.
But failure to articulate universal moral rules concisely, doesn't mean there's no concensus.
Circumstances and relevant context can be very complicated and laborious to describe, but there are still many cases where overwhelming majority of people would agree on what's right and what's wrong.