You have conversational tones and vocabulary, and you use them only with a certain group of people or an individual.
What happens when you build this particular tone over a period of time? I think they are forged that way unless there’s a massive external factor influencing that behavior.
What can be the drawback of this? Possibly, it will be difficult to have a conversation that is outside of this tone and possibly limit the number of topics you can talk/ discuss with that person/ group.
Call it a conversational threshold, maybe?