"And thus not flood people who dislike a thing with ads promoting the thing."

But isn't that what these ads are about. They want to show the people who dislike a thing with ads promoting the thing so that hopefully one day they will like it.

Sure it could make you hate it more, but unconsciously or whatever, you will be affected.

I see ads for shoe brands I don't like or care about, but for sure, the next time I need to buy a pair of shoes, that brand name is on top of my mind.