If youre a big pker and big shot guy ''this my wild l0o0o0ol stay out'' you should be allowed to flame each other 18+ zones no children allowed this not for the weak hearts some players have.
This how i imagine every flame i see inside pvp (snagged off reddit osrs) and to me flaming inside the wild is more comedic then actually being serious and trying to degrade another user with the use of mean words.
In short, shit talk and flaming should be allowed in pvp.
http://i.imgur.com/xKZ8SiT.mp4