> Can you show me even one example of "It's so simple, even your father could use it!"?
If I were to search for an example of a clueless user, I'd fo for my father instead of my mother, because that's the say things are.
Actually, I don't even do that because I don't feel the need to give an identity to archetypes apart those that define the archetype. If I need to talk about the clueless user, I'll say "clueless user".
It's not often that I see girlfriend and mother, I suppose they're really a problematic cliché, but I find it rare.
I'm also sure you can find many biases that are not sexist biases. For the grandmother, well, I'd think that it's an image of demographics. What's your image of elderly people ? For me it's a woman (I have two of those alive, but no grandfathers, in my country there's a 7 years difference between male and female expectancy).
Not that I deny sexism, but I think some people see too much of it where it's not necessarily there.