I do not see any reason other then personal dislike, even for programming embedded systems and similar things. In C++ you pay overhead only for features you use. You can use the C subset of the C++ in some specific situations where C++ overhead is too high for you. This said, I think some C programmers overestimate the overhead of some C++ constructs. Let me list some examples:
- Classes and member functions have zero overhead compared to normal functions (unless you use virtual functions, in which case there is no overhead compared to using functions pointers)
- Templates have very little overhead (most often no overhead at all)
One valid reason would be when you are programming for a platform which does not have a decent C++ compiler (no C++ compiler at all, or a compiler exists, but is poorly implemented and imposes an unnecessary high overhead for some C++ features).
