One thing that puzzles me about the technologically-inept mom stereotype is that women are still more often employed in clerical positions than men, and these days, that requires working familiarity with computers.

Developers are more likely to be men than women, still, but how many people's dads are developers?

Seems more age discriminatory, as in older people are less tech-savvy.

Well done indeed! This is the kind of things that tick my mom off - she's a lawyer who has done most of her work on either typewriter or computer for decades, but still got an informative handbook explaining what a mouse was a few years ago. She's been keeping tabs on her own inheritence, savings and pension for all of her adult life, and but still get a stock salesman acting like she doesn't know the first thing about saving in stock, all because of her age and gender. Seriously, is it so hard to believe that grown women can have skills beyond home making?

though I would say this is calling out SEXIST advertising, not just "gendered."

Calling out sexist, gendered, and AGEIST advertising. Ageism is important here. Advertisers may accept that a 50-something person could use a computer, though never hack. They may accept that a young woman could use a computer AND hack. But an older woman? INCONCEIVABLE

This is just like a question I had on an exam not long ago! We were asked to explain a concept from the class to our mother. My mother is a professor of that same subject, so she definitely wouldn't need it explained by me! Regardless of my mother's job, though, I was not pleased to see that a specifically female person was invoked - why not imagine explaining to a friend who'd never taken a course in the subject?!

As well as the ageism and sexism, I notice they're using an outdated model of left-brain/right-brain split. This woman knows that that's a myth!

Confirmation bias at its finest. This advertisment is about older people not being tech-savvy, not about moms being less tech-savvy than dads. There might very well be an ad or a gazillion ad's about fathers not being good at using computers, but since no one thinks those are sexist they go under the radar. The only ones that get posted on websites like these are the ones that talk about women, so then people automatically assume that the ad is sexist.

Reminds me of the grossness of the "It's Time to Tell Mum" campaign against Internet censorship here in Australia.

http://hoydenabouttown.com/20100601.7577/the-lamb-roast-roundup-mums-and-censorship/

Did something like that when I took college stats. The question wanted a lay explanation of something - I forget what now - but the phrasing was, "Explain in terms your mother would understand..."

I wrote, "This is where I should probably mention that my mother developed and teaches the stats curriculum at her school."

While that is indeed a stupid ad, that's not "gendered" advertising, that's just misogynistic advertising.

"Gendered advertising" would be advertising that acknowledges that human beings come in male and female varieties, which would be - oh wait, that's already everything ever.

ITA is notoriously lame with their hiring ads. It irks me that they're supposedly a legimate software company, but they keep insisting that they want to hire 'hackers', which is industry slang for undisciplined programmers.
"Hackers with people skills" is an oxymoron.

I'm not completely certain that it's invoking a stereotype of women being stupid and therefore unable to grasp technological concepts. It may be that and/or the other tired old trope that women just don't give a shit about gadgetry.

If I had to phrase a "explain it simply" direction, I would go with something like "Explain it to a fourth grader, who has the vocabulary, education, and attention span of a fourth grader. Good Luck"