Are all cultures equally valid?

In class we have been discussing whether we agree if each and every culture is valid.  We also had to write a post and come to class prepared to discuss.  In my post I said that each culture is different from another.  I still see this as true, but my view has changed a little.  Cultures have more similarities than we think; we may just show them in different ways.  For example, when traveling to Samoa I noticed how different things were from the U.S.  Now thinking about it, we are more similar than different.  We show love just like they do.  We may show it in a different way, but there still is the emotion of love.  By showing this emotion in a different way is what makes cultures so unique.  We are blindsided by how different we think it is, but we are forgetting to think how similar each culture is.