In my opinion the western culture reached its height in/around 1900 if you can talk about hights in culture at all.
I fail to see how that is the height. Western culture at the time was just viewing yourself above everyone else who isn't white, the right to impose your supposedly superior culture on others and all around being incredibly racist, sexist and in general intolerant.
No no, the best 'Western' culture has ever been is right now.
Ever thought about literature, music, operas, theatre, art ...?
Nowadays we have missing moral courage, electro music and this is modern art:
In what position are you to say today's art is shit?
People said Salvador Dali was a degenerate for his art. Picassos works were considered trash until he died. Just because something isn't your piece of pie doesn't mean it is worth less than works from past times.
Today's literature, opera and theatrical art is still top of the line, even if it's not the same as it was before it's still great works. Guess what, times change and things do not stay the same, accept the present.