For every person who says on the internet that you can just use a C++ subset, there's another who insists that C is the bad C++ subset. So compiling C code with a C++ compiler promotes your code from "good C code" to "bad C++ code" (most C code isn't "exception safe," for example).

It's arguably irrational to evaluate a language based on this, but you can think of "this code could be better" as a sort of mild distraction. C++ is chock full of this kind of distraction.