I'm pretty useless when it comes to using a washing machine. Like, a proper household one. When I was at home, my mum did all that sort of stuff - I always felt like I should do my own but never got the chance because she genuinely enjoys doing laundry. Here, we just have a launderette with monkey-proof 'put money in and press one button' machines. It's not a difficult thing to learn, in fact I'm pretty sure I'd only need to be shown once or twice depending on different settings, but I've just never bothered. I also have no idea how to use a dishwasher because I've never had one - my parents are 'of a certain age' and they don't see the point of paying loads of money for a machine to do what takes a few minutes and mere pennies to do by hand, and I'm inclined to agree.
I can cook, but choose not to. We only have useless electric cookers here so I just throw stuff in the oven and be done with it... I'll cook a lot more when I've got a nice gas cooker to use. I'm shocked that anyone wouldn't know how to sharpen a knife, although admittedly I don't have a knife sharpener here, call it a by-product of not bothering to cook. I'm even more shocked that people would rather buy new knives than sharpen them, those things aren't cheap.
As for clothing: I know how to repair stuff if necessary but, honestly, it's unlikely I'll bother unless it's something that cost a fair bit of money. In the case of socks, the needle and thread to repair them would probably cost more than buying a new pair.
Minor household repairs are no problem, largely because I used to enjoy taking things apart and seeing if I could put them back together again. That and I always seem to get a new tool kit for Christmas every year because nobody knows what to buy me any more. Changing plugs and fuses, no trouble. Putting up shelves, cool. Bicycle repairs: probably still alright, although I haven't owned one in years. Assembling flat-pack furniture: I actually enjoy it.
When it comes to cars... yeah, that's where I have almost zero knowledge. I don't drive, so I've never considered it necessary knowledge. Even when I was taking lessons I figured it was something I could learn later on. If I ever get back to learning (which will entirely depend on where I end up living in the next few years) I have plenty of people who can help teach me that sort of thing.