These are bad schools. I'm really not willing to compromise on this statement.
Is this because teachers don't like teaching in C? Or because students prefer the speed of development of a language like Python or Java? Where are the students who do like C? Where can I find those guys (and girls)?
It's because C and systems are inherently hard and cannot be made... not. When your libraries are limitless your programming exercises can be made as trivial as possible.
I also always choose C if companies let me choose my language during interviews. I can fit the entire C language and its libraries into my brain all at once with no reference manuals.
C++? I don't think I could get everything even if I had the specification and Bjarne himself standing next to me.
These are 95% of schools.