I think someone can certainly explain an idea if both people take enough time and have enough motivation.

The thing that stands out for me is people who have different ideas concerning where the obligation is in communicating concepts. Is it the speaker's job to put things so the listener can understand? Or is it the listener's job to spend time parsing an objectively correct explanation? In society, overall, this involves a process of negotiation. Notably, I think some people who's job involves manipulating abstract ideas don't think it's their job to put spend time putting concepts into a form appropriate for a given person - the concepts being expressed in an abstractly correct fashion is sufficient.