I kinda of know what you mean. I sort of help people on the phone. They ask a question, I answer and it goes over their head. Or they act like the answer wasn't good enough. Like you said...you just have to bite your tongue. I mostly get defensive women, thinking I'm some female calling for their man! Which is freaking crazy to me. But, I know it must be frustrating. Especially about computer things. And men do like to treat women sometimes like we have no clue of what's going on. Stupid.
This guy one time asked why he doesn't have *69, and I said sir you have caller I.D so you don't really need *69. That just totally went over his head, and he kept asking for it. I'm like man nevermind, he doens't get it. LOL