Sadly, this is not just a Trek thing. There is (and has probably always been) a portion of the science fiction audience that feels strongly that "SCIENCE fiction" is about ideas, not emotion, and that finds too much emphasis on feelings and relationship (often dismissed as "soap opera") almost as distasteful as Vulcans might. Science fiction is supposed to be about cool, competent scientists, soldiers, and engineers who seldom break a sweat even when escaping from the event horizon of a collapsing black hole. Emotional crises should stay in "mundane" literary fiction where they belong. "If I wanted to read about people dealing with their personal issues, I wouldn't read SF!"
By coincidence, I recently stumbled onto a discussion, elsewhere on the internet, about the works of A. E. Van Vogt, where one of the other posters was, to his credit, quite open about the fact that when it came to SF, he only cared about the ideas, not the characterization or the prose style, and in fact preferred his SF straight up, with as little interpersonal drama as possible.
Me, I grew up on authors like Sturgeon and Matheson and C. L. Moore, not to mention Rod Serling, so that's not a sensibility I particularly share, but, in my experience, it's always been present in the field.