Faster communication gives misunderstanding less time to cool.

A misread message used to take days to answer and the heat drained out on the way. Now the reply arrives in ninety seconds, still hot, and each round adds fuel before anything has settled. The speed is doing much of the damage on its own.

Introduce your own delay when something stings. An hour, a night. You are not avoiding the conversation, you are giving it a chance to be a conversation rather than an exchange of reflexes.