The C and C++ hate comes mainly from web developers and language hipsters. They dominate the echo chambers of HN and /r/programming.
When you mention you are a C programmer or like coding in C, they begin to blabber about C being legacy, Rust this, and Go that (languages they think are more like Python). All in an effort to cope with the insecure feelings they have because the C programming language and C++ (read: pointers) intimidate them.