This is mathematical savagery at its finest! The first line tells someone to go play with their "square root of negative friend" - which is imaginary because you can't take the square root of a negative number in real mathematics!
Then it gets even more brutal with formal set theory notation stating that the intersection of the person's friends and the commenters on the thread equals the empty set. Translation: none of the people commenting are your friends!
The final mathematical burn uses limits to say that as comments approach infinity, the number of f***s given approaches zero. Pure mathematical destruction!