This is fallacious and extremely disrespectful (or even malicious?). You don't have to propose a way to fix a broken thing to point out that it's broken.

Normal and sane people understand this intuitively. If someone goes to a mechanic because their car is broken and the mechanic says "well, if you can tell that you car is broken, then you should be able to figure out how to fix it" - that mechanic would be universally hated and go out of business in months. Same thing for a customer complaining about a dish made for them in a restaurant, or a user pointing out a bug in a piece of software.