#6: Break a Leg
When it comes to show business, specific blessings for good luck are often spoken before a performance. And while some people might not choose to use or believe in them, that doesn’t automatically make them offensive…

Why would this person think that this commenter was honestly wanting them to break a leg? Everyone knows that “Break a leg” means “Go, get ’em!” and not “I hope you break one of your legs during your performance.”