You’re confusing two different things.
That was to point out that there’s unwritten rules. Technically neither play was against the rules but both elicited a response.
People here are arguing that they’re glad Rielly did it because of breaking ‘the code’. I don’t think anyone is arguing what Rielly did was legal or within the rules.
You can support the decision by Rielly and live with the consequences. It’s up to the individual.
Sheldon Keefe, for example, thinks it was warranted. That doesn’t mean he doesn’t think there will be consequences or that it’s legal. It really depends on the individual and how egregious they think that Greig did was.