I'm not the one who decided to create a post in a science fiction community claiming a huge portion of science fiction isn't "true science fiction" based on my own tastes.
Of course the point is semantic, do you want me to base it on what? Your favorite novels?
That's how grouping works, yes. You and I are clearly different, yet we are both called "human". In fact, you and a giant panda are both "mammals" despite being radically different.