Cross the line
Be a bad (or poor) taste
Be the butt of a joke
Can take a joke/ be a good sport
Be the person on whom a trick, or "practical joke" is played; be the object of ridicule
Be able to laugh at a practical joke, even when one is the butt of it, without getting insulted or taking it to personally
Go beyond funny into something mean, hurtful, offensive or cruel
Be offensive or extremely cruel