My oldest has referred to my youngest as being this, and it has giving her a real complex.
I know some will say "it's kids just being kids". But it's not just a bullying tactic with real ramifications, but it is also a body shaming tactic that can go as far as young kids taking their lives.
Conclusion...
So next time you want to snicker at a kid and say how 'F' he is...well think again because the consequences can be life altering.
Just my 2 cents...whatever that is worth