Some people really talk a load of bollocks.
Words are just words is far too simple.
Words are communication and are vital to any society.
Words on thier own are pretty limited, they have to have meaning otherwise they're useless.
There is also the context and of course the inflection, where , when and how words are used can completely change thier meaning.

Swearing all the time is boring , the over usage of the cuss word diminishes it's potency.