I think the rule "Don't interrupt" still holds, but is more nuanced. If you just cut someone off while they are talking and start saying whatever you had been w

I think the rule "Don't interrupt" still holds, but is more nuanced. If you just cut someone off while they are talking and start saying whatever you had been wanting to say that whole time, I'd consider that interrupting them. However, I don't consider it interrupting if I am saying something complementary to what they are currently saying that is brief but is signaling that I want to say something. For example I'd give an auditory cue that I want to say something by saying more words than I normally would just to signal that I'm actively listening such as instead of just saying "mmmhmmm" I'd say "Yeah something similar happened to me" and then give them time to finish up their thought and begin speaking myself OR allow them to move the conversation over to me explicitly. Depending on the speaker, if they don't pick up on that cue or continue to just ramble on, I repeat and intensify that to the point where I may actually interrupt them so that I can speak, but at that point it's not necessarily a negative behavior, it's just neutral. My interruption negates their negative behavior of orrating rather than conversing.