We have not allowed ourselves to fall out with anyone. And we have never discussed it, as we knew it was dangerous ground with some people. But we deliberately keep away from some people, some very close to us- ad we have experienced that it is THEM that will insist on discussing it - and us who have to quietly walk away, lest it would affect our relationship- some very long term.
If you invite someone, who arrive and throw the DM on the table, and say 'thought you needed some factual reading' and not joking either...what do you do- espcially if they are sataing for 10 days. You take it, diffuse, talk about the weather and the food, and anything else-but they insist on bringing it back to B - and you diffuse some more, and take the dog for a walk .. but you also know, that things will never be the same. Sad, but true. And this is not about 'a difference of opinion' but all that stands behind it all... enough.