you have to play their game:
"I just find it really emotionally exhausting to speak on because I just care so much and in order to protect my mental health, I have to request that we not speak about this in a casual way because of how important it is to me."
then when they continue, you attack them for being insensitive to ur mentulz and announce you'll have to temporarily disconnect to not be further triggered.
they have dog whistles you can use that says you're on their side enough you don't need to be actively converted.