“Kill your darlings, kill your darlings, even when it breaks your egocentric little scribbler’s heart, kill your darlings,” said Stephen King, riffing off of a William Faulkner quote about writing. King and Faulkner were pointing out that the best writers are willing to erase portions of their writing that don't fit the larger story, even if the writing itself is good.
It’s the same with conversations. The best conversationalists are willing to go with the flow instead of trying to insert a thought from a few minutes ago wherever they can, even if that thought is clever, funny, or insightful. They're willing to give up contributing any given idea in order to be more present.