No one is against languages. We all have to communicate.
This is definitely geared towards America and english speakers though. I have visited many places where people only speak their native tongue and they are far from worthless or listen to willie nelson. Some of them very rich too.
But...
Language is a part of culture. Culture is the expectations of the world around you, ie behavior, attitude, milestones with language being one of them. Just because people speak different languages doesnt mean they arent a part of the same culture.
Colonial Americans made it a point to speak with a different accent than the british loyalists and have different meanings for words. Very different cultures at present day.
Thats like saying Mexico and Puerto Rico are the same because they both speak spanish