Men who aren’t insecure about their intelligence won’t typically be affected whenever they’re interacting with women who are smarter than they are.

"Insecure" strikes me as not quite the right word, as it suggests "uncertain," which I don't think is the issue. We all want to bring somethng unique to a complementary relationship. Some men think that their smarts are the thing they have most to contribute. Some don't. The first group is indeed, "emasculated" by a smart woman, because a man whose strength is his brain has less to offer a woman who already has a good one. Throw in a touch of Dunning-Kruger, which causes a bunch of mediocre men to think they are smarter than they are, and a lot of men feel that the thing they have to offer isn't worth all that much.

Thus, a smart man may not be "insecure" about the level of his intelligence, but he may be, well, smart enough to realize that it isn't as attractive to a smart woman as it may be to one who sees that intelligence as a complement to her own assets. The study seems to show that opposites attract, even when one might think, from a distance, that they don't.