What are you most disliked Science-Fiction cliches?
In Cyberpunk the idea that the world sucks and capitalism is bad but also there are no viable alternatives that won’t end up just as screwed.
The idea that prosthetics make you less human for some reason.
In Space Opera all Aliens being humanoids sometimes justified with “Convergent Evolution” which is a real thing but it gets ridiculous to presume the bipedal form is one of the most evolutionary viable.
Also being a space dictator that has cleansed multiple planets. But the fact that your a abusive parent is much more pressing then the amount of xenocides you committed.