Personal use of proprietary software in the 2020s.
Or running a company to be completely dependand on dozens of unreliable and expensive proprietary software vendors.
This isn't poorly educated, it's just a mistake in our education system where software isn't treated as well as it should be considering our day and age.
Even so, there are valid reasons to use some forms of proprietary software. Not every program has a good FOSS alternative. I would encourage people to look into FOSS alternatives but I wouldnt call someone poorly educated because they play games other than SuperTuxKart and Kmines.
I agree with you that the problem is in our educational system: for the most use cases, LibreOffice is just as good as MS office, meaning that they're both equally crappy. But since the former is free (as in freedom and as in beer) that should be the standard in schools and universities.
The good thing is that movements to bring FOSS in public administration and schools are starting to battle, and already had some victories, most notably in Germany and France