This is basically a masturbatory defence mechanism - claiming that an obvious flaw is actually an asset. I'm not saying you should just vomit out every word that comes into your head. But this kind of statement implies that there are the oh-so-very-smart-and-thoughtful quiet people, stoicly listening in their wise wisdom, and then the loud, vulgar idiots who endlessly blather on. They probably eat fast food and watch reality tv, too.

But... no. Being thoughtful and choosing your words carefully, being kind, understanding what other people are saying before you speak. That's all great. That doesn't mean you're "quiet". Thoughtful people will still interject with their own views, ask followup questions, or push back on things they disagree with. All of which require speaking - and so if you do these things regularly, you won't be "that quiet person who never speaks"