A person who constantly interrupts may be hearing words without receiving them.

Interruption is often not rudeness but a symptom of hearing without receiving. The words are arriving, the mind is already processing its own thread, and the interruption is that thread surfacing. The person is present and not actually taking anything in.

If you interrupt frequently, the fix is not just restraint but attention: try to be able to summarise what they said before you speak. That requirement forces you to actually take it in. And when someone interrupts you consistently, it is worth naming plainly rather than absorbing.