What we call gut feeling is often a subconscious interpretation of the person’s body language, physical appearance and tone of voice. It’s always good to try to explicit why you had that feeling before basing your decision on it.

I often think that shy people are assholes at first. Now that I’m aware of that I try to test the shyness hypothesis first when I have that feeling.

So exploit it, it’s something humans developed for good reasons. Just be aware of the biais and use it as a good starting point for a behavioral interview.