I think it might be worthwhile to consider the influence that the egoistical and condescending example person might have on someone who is not a perfectly ratio

I think it might be worthwhile to consider the influence that the egoistical and condescending example person might have on someone who is not a perfectly rational actor, and possibly easily cowed into giving up on a technical discussion or retreating from the project as a whole. Sure, ideally all contributors to open-source projeccts are thick-skinned and confident enough that harsh condescendence will not affect them much, but in reality, they probably are not, and I would rather cater to them than to the "assholes" who might be scaring them away.