Just a man paying his parking ticket

It's not about the person
It's about sending a message

It's not about the meme.
It's that no one cares in the first place.

It's against the law to refuse any kind of cash if someone is willing to pay for something

Actually, its not. The federal reserve HAS to honor anybodies penny, dime, dollar, hundred dollar, etc. BUT that doesn't mean anybody else has to accept them. It's not illegal for Apple or Airlines to require payment by credit card, nor is it illegal to require no bills larger than 20s at a convenient store. In fact, depending on the way you do it (ie dumping all the coins on the counter so they scatter everywhere) you can even be charged with disorderly conduct

Also, that appears to be in Australia, so it would also depend on what laws they have, the above was for laws in the US

It is against the law. There have been reports of stores denying payments and the news would call the police on the stores & end up paying a fine

agreed. He did something wrong, doesn't mean he needs to be a douche to somebody that had nothing to do with it