I'll add to this really good post that additionally you may wish to approach this from a 'meta' discussion, less about a particular topic and more about the met

I'll add to this really good post that additionally you may wish to approach this from a 'meta' discussion, less about a particular topic and more about the methods used to evaluate an argument or a presentation of evidence. Perhaps you can agree on methods for assessing evidence as a starting point, and then jointly apply them to a particular issue, once the collaborative atmosphere has been established. FWIW I've had more luck doing this in email rather than in a text client or on twitter. The communication medium has to allow for a longer-form discussion, both to establish common ground, with minimized emotion, and to enable the nuance to be worked through.