I would be straight forward:
'I do not want to fight you.' if he pulls the 'ZOMG u COWARRD!' then just keep saying it ^^ idiots only realize that they're idiots when they're being outclassed.
Once you lay that down, I would ignore him for an hour or so until his attention shifts to something shiny and he forgets everything that happened in the last five minutes, along with all their fifth grade math skills.
Its very admirable what you're doing in this circumstance ^^ stay cool!
'I do not want to fight you.' if he pulls the 'ZOMG u COWARRD!' then just keep saying it ^^ idiots only realize that they're idiots when they're being outclassed.
Once you lay that down, I would ignore him for an hour or so until his attention shifts to something shiny and he forgets everything that happened in the last five minutes, along with all their fifth grade math skills.
Its very admirable what you're doing in this circumstance ^^ stay cool!