I don't limit my statement to just C. The topic was C however so I mentioned C.
Your comment reads like a red herring though. You're not actually trying to argue that C makes thing easier or hard. Your red herring only means that hard problems affecting all languages aren't magically turned into non-issues in C. You can still write a C program that uses threading and is as safe as any other language and end up being a far simpler project, but that means nothing because the subject is still hard. And what would that actually say about C, let alone refute?
I’ve worked in a lot of massive and unmaintainable codebases, and I’ve always had the most fun untangling C ones. I don’t know exactly why, but I suspect it’s because at their core they are always plain ol’ simple C.