I know I could do C++, and you could argue that's better, but I find C++ to be exceptionally irritating to use. Every time I've used C++ I get people telling me I'm using it "wrong", sometimes in contradictory ways. Sometimes I should use a "friend" function, sometimes "friend functions are evil". Sometimes multiple inheritance is fine, sometimes it should be avoided like the plague. Sometimes you should "obviously" use operator overloading, sometimes you should avoid it because it's confusing because you don't know which functions are being called.
I'm sure someone here can "educate" me with the best practices for C++, and maybe there will be some reasoning for it, but ultimately I don't really care. I just found the language annoying and I don't enjoy using it. I know that I could "just write it mostly like C and use the C++ features when I need it", but I have just found that I have more fun thinking in pure C, and I've kind of grown to enjoy the lack of features.
Maybe it's just a little bit of masochism on my end, but I like the fact that C gives you so little. You kind of have to think about your problem at a very fundamental and low level; you have to be aware of how memory is allocated and deallocated, you don't get all these sexy helper functional-programming constructs, strings aren't these simple automatic dynamic things that you have in basically every other language. You have a dumb, simple language that will give you exactly what you need to write programs and very little else.
Most stuff I write uses a garbage collector, but the safety and easy of writing stuff with garbage collectors like Java makes it very easy to be lazy. I've grown to appreciate how much C makes you actually think about problems.