> "That sounds crazy" - Yeah, it kinda is. In practice this is rarely enforced

Generally, selective enforcement is itself a huge problem. That might not actually be an issue in this instance though if the only thing preventing enforcement is the lack of a formal complaint and assuming that the complaint process is easily accessible to everyone (not requiring money to file, and without other barriers that might prevent certain people from filing but not others). It's still a terrible idea to make it illegal to insult others, but "rarely enforced" may not be the red flag it usually is.

Well, time is money, right? If someone files a complaint and goes through with whatever proceedings ensue you can bet that it's not a single mom working a full-time job. For police officers, on the other hand, enforcing this law on behalf of themselves is part of their job. So in practice this law is grossly unfair. It does lead to a greater level of decorum in public debate than in most other countries, which is nice, but it's not a fair law by any means.