You two should both stop fighting. It's childish on the part of both of you.
However, qdz has no professional standing. If he makes false or irresponsible or uninformed statements, or acts childish or petty, so what. He doesn't represent anyone but himself.
Def you are on here as a self-claimed representative of IB. If you act petty and childish in response to qdz or anyone else it reflects on the company you represent. If you let qdz irk you into stooping to a lower level of reply, you do a disservice to the firm whose reputation you are trying to defend. If you respond spitefully toward qdz, as a representative of IB, that does far more damage to IB's reputation than any off-the-cuff remarks made by him can possibly do.
We all know that IB has a billion debt-free dollars. Now let's move on, ok. Enough of this Tom & Jerry show already.