Very often. When I meet someone for the first time, I almost always like or dislike them immediately for no fathomable reason. More often than not, that like or dislike turns out to be justifiable - the people I immediately like tend to turn out to be good, reliable, trustworthy people; those I dislike tend to be the opposite.
When I first saw Trump on TV, promoting his (ghost written) biok "The Art of The Deal", I immediately disliked him without knowing why at the time.
I fidn my intuition about people is usually pretty good. Every time I ignored my intuitive feeling about a person, Ihave regretted it, as the personlater screwed me over in one way or another.
I think our instincts or immediate likes and dislikes evolved to help us better survive our fellow humans. When I listn to my instincts, I do much better than when I don't.
Reminds me of the old joke by Bob Dole, the funniest politician I ever heard of and someone I liked a lot, even tho he was a Repub. He was the master of the dry humor and terse jokes. I think he was talking about Phil Gramm of Texas, but the joke went like this. Gramm asked Dole why people seemed to take an instant dislike to Gramm. Dole replied dryly, "Saves time".