Some of my closest friends are like this. They have no filter. Thought pops into their head and they say it right away even if it's extremely stupid or extremely rude. That's definitely genuine.
I also think people who sound stupid tend to be more genuine. It's not that they are stupid but because they are such genuine people that they aren't afraid to say something that sounds incredibly stupid. The ones that seem smarter might be just as stupid but they are afraid to sound stupid.
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