The worst of the worst are those who react before the other person even ended the sentence. Those people themselves most oftenly consider themselves as intelligent, because - in their minds - they already know "everything".
But, sure ... that's not helpful in regards to your post.
The opposite must be true, because otherwise you give room for the idea that thoughtlessness is intelligence. As the depth of thoughts is a function of time, the longer the brain can "analyse and gather", the better the response will be.
The less time spent, the less time the brain has to "analyse and gather", which means that it will bring up whatever matches the patterns first.
It's quite amazing. We're capable of conversing without needing to actually think about what's being said and people aren't even noticing the fact that they're not actually thinking about what's being said.
If you wish to believe that (consciously or not) reducing ones self to pattern matching in conversations equals (any level of higher) intelligence, then I'm not convinced you have any practical experience on the matter.