Once you understand someone is delusional, there is no point.
https://en.wikipedia.org/wiki/Allegations_of_genocide_of_Ukr...
7 countries voted that it is, and prominent historians at ivy league institutions (you know those one's people badly want to get into so they can learn from the worlds top experts) have said it definitely is.
As far as I'm concerned the matter is pretty settled.
The person you're talking to doesn't have any desire at all in understanding you, nor do they have any desire to create the best argument against themselves and respond to that.