As a general rule you can judge the level of quality a conversation has degraded to by the frequency of people multi-quoting and nitpicking back and forth.
There's generally use useful flow to a conversation, and where you feel the need to go through something someone else has said line my line as if you're doing a close reading English essay (and that's bad even in an essay)... that flow is disappearing.
I think the conversation would be better served by making your points of argument cohesive of themselves, if that's the road you're committed to go down (not going to single out anyone here directly, it happens with a few).
