I've had to let go of incompetent managers (I used to manage managers). Maybe I am an incompetent manager myself that no one has discovered, so take my input with a grain of salt.

Competent managers will listen and not jump to conclusions, collaborate with you, ask thoughtful questions about your work driven by curiosity and not because they want to control or micromanage. They will usually be able to catch up and understand what you say and the technical work you do when you explain it (make an effort and you'll be surprised). If there's some tech you work on they do not understand they will educate themselves and ask a bunch of questions trying to catch up so they can help you and assess you fairly.