Some of the values, which are traditionally promoted as being the Western values, like freedom of speech for example, are actually universal. There is nothing wrong about Western values, because they have created a system, which, in any case and despite all its imperfections, has proved to be working. The problem is that everybody is already tired of listening about those.
On the other hand, you are right that by globally promoting Western values, the cultural diversity of the different places all over the world is undermined. Of course, at the end of the day, it always comes to money, power and influence. Rich countries always will have the means to advertise their own cultures and the rest will just fall under the label "exotic".

I can resist anything but temptation.- Oscar Wilde