Yahoo has provided us with many good tools. The first is just clicking "IGNORE" on one of his posts. That alone will clear the entire board of his annoying posts. You wont even know he's here annoying us. That simple action totally destroys his PRIME purpose to push all other so called basher posts down the page into oblivion. You win, he loses. Period.
The second option to you is just ignoring all his posts. DO NOT REPLY TO HIM FOR ANY REASON WHATSOEVER. That forces him to work even harder to reply to his own posts (to keep them on top of all other posts).
The third combat tool is one that I recommend in addition to the above two. REPORT HIM TO YAHOO many times each day. Yahoo can't ignore so many complaints about one user. They will terminate him.
Us all three tools. He is a pest, a very psychotic schizophrenic mental case. This kind can even be dangerous. It's really best to rid the board of him. Not that YOU are much better, mind you. You too are more-ons and naturally schizophrenic. But, do your duty and practice all three recommendations above.