“I’m not a total idiot, just a partial one” is a phrase in my lexicon that has served me extremely well. It’s a swiss-army knife of a phrase (good in any application). Check it:
When someone says or does something to you that indicates he/she sees you as inferior or less than capable, this phrase can gently, but firmly express that you are not stupid. In one sentence, you’re being simultaneously self-respecting AND self-deprecating. It sends a clear message, but there’s some comic relief there too to make everyone comfortable and not make you seem psycho. Cool!
“I’m not a total idiot, just a partial one.”