I'm a Mensa member and have an IQ past 150. I also struggle with higher math. I can balance my checkbook. Which is good, I suppose. I hated Trig and Chemistry. Being intelligent as measured by an IQ does not prevent you from saying or doing or believing stupid things. Best I can tell, being a Mensa member means you probably understand 'insider' jokes faster than someone else.
One of my mom's 'educational psychology' texts defines intelligence as the ability to make closer and closer connections; to associate ideas in more complex ways faster than others. I accept that. But if your best friend takes a week to grasp what you understood instantly, the difference between you is minimal, isn't it?
Annie