I would think that the only way to overcome a disregard issue would be to somehow increase your personal relationship. If he is acting from a position of "fact

I would think that the only way to overcome a disregard issue would be to somehow increase your personal relationship. If he is acting from a position of "factual" strength then the only way to change his behavior would be to introduce emotion into the thought process. These type of coworkers can be exceedingly difficult if not impossible. The above is only speculation, and has never actually worked for me in a total resolution, but it has made it slightly better overall. TLDR Heartstring attack.