Its a good suggestion and i support this, but is very easy for a troll to bypass this, for example:
Hi Blonde, battle with me
Hi Blondeeee, battle with me
Hi Blonde, Battleee with me.
If the troll knows how this works, he can keep spamming with any problem.
Also a "trigger word" like jumpeon its a good suggestion but it's the same thing, a troll can bypass this by writing JJumpeon, jummpeon, etc.