A simile/idiom similar in meaning to "one man's
trash is another man's treasure" only, in this
case, it means that what is funny to one person
may be offensive to someone else.
Tom: "Man, I told this hilarious joke last
night. Everyone laughed but
Bob. He was a douche and said the joke was offensive."
Dick: "
Don't worry about it, dude. One man's LOL is another man's WTF?"