Standards improve, including those of beauty. The progress in it is that it becomes more inclusive. It can be said to be universal only in that all societies have established ideas about what is beautiful. Therefore, the idea of a fixed sense of what is beautiful is true to all civilisations and societies. How it is rewarded is too sometimes the same.
The fact that we dont agree as a hemisphere, as a nation, as a race or whatever demographic and its resulting dialectic is what moves the idea of what is beautiful forward or around as it can prove to be cylical and trend driven.
What we must accept in discussing beauty is that disagreement and division serve a purpose. It is my view that it serves to advance ideas about what beauty is. There is irony in beauty, tragedy can even be beautiful. So can bounty and the finite. There is beauty in the extremes and in the moderate.
One of my favourite puns can be found in the statement "beauty lies in the eye of the beholder".