This has been the only game I've played competitively where a significant portion of people vilify others by playing by the rules. I mean, what does "Fly Casual" even mean any more? It should mean both players are playing by the rules at all times and they're cool about it (measure your range, check arcs, declare when appropriate, etc.). However, as others have mentioned, it has become an excuse for sloppy play. I don't mind reminding people of rules in a casual game but playing in a tournament expectations should be higher.
In summation,
Play by the rules and by cool about it.
Call a TO over if you need to.
"Fly Casual" is dumb and doesn't mean anything anymore.

So yeah. It's exactly as simple as people like us have said. Follow the rules, don't be a womp rat about stuff.
Edited by That One Guy