Real Life Troll.
Used to define someone who says antagonising jokes or talks offensively about controversial topics, as bant
Also includes those who carry out pranks on other people in real life, which may be offensive, slapstick
based, contain elements of internet humour
, or be a practical joke
"Dude, that guy wearing a bear costume just kidnapped a little girl!!!"
"Yeah, don't worry, its a joke. He's a massive RLT"