I can do syllogisms all day long.
It's funny. You'd think that, with our industry's reputation for being both sexist and ageist, we'd work to try to understand how we've gained that perception, rather than just double-downing on it and claiming there is no problem.
Here we go, why don't we just say "clueless user" instead? That would cover all the Millenials who have to google search to find the Facebook login page, too.
You're the first person in this thread to use the word "grandpa" in this context. If it were really "just as good" of a term, it should be random chance whether people use "grandma" or "grandpa". But there are eight instances of the word "grandma" used in context in this thread alone, and the first time anyone even thought to use "grandpa" was in trying to defend their subconscious sexism, rather than try to use it as an opportunity to learn how to reduce narcissism in their life and be more compassionate to others.
We all have narcissistic tendencies. Our contemporary culture promotes it and contributes to its growth. We all have to work hard to fight the trend and remove it.
That's because it's common to talk about "grandma's house" and similar things with feelings of quaint comfort. The reason to pick that arbitrary sex is not because of an -ism, it's because it's cliche. It's like using 'he' for unknown gender. It's biased, and that bias is bad, but it's not done out of sexism. It's not out of preference for people of either gender.
> treating everyone as objects
It's a rhetorical device. You're not supposed to be talking about real people. The stronger the disconnect there the better. That's why "clueless user" is also bad. It makes things a bit too personal.