Never stops

Sometimes in life a person is going to try and come down on you emotionally.
If you don't give them the opportunity by acknowledging they're emotion, then they might try a different approach due to a feeling that came over them after there first approach, or push for emotional satisfaction of the original degree.
This cycle is amplified by a ratio. A ratio which depends on the conditioning the mind in question has had, and the amount of approval you give that conditioning. When you have had success not reacting to a persons emotional output, you have now unlocked a new question. Has this mind made the conscious realization that you aren't reacting because this isn't necessary (unlikely). Or, have they decided to get more emotions involved and defend their pride for 'what they know'.
Pride for 'what we know' tends to be outstanding in regards to typical minds 'conditioning'. The 'what we know' is based on past success, or installed by guardians/idles that show beneficial outcomes of this 'what we know'. Most of this pride for what we know breeds; impatience, greed, jealousy,negativenegativenegative. And only more ingrained pride when solidified by positive emotional experiences. That, when can't be satisfied turns into pessimistic justifications.
Now, this ratio is ultimately undefinable without a highly refined sense of intuition, or a complete psyche analysis. A persons mind can be different from every angle to every person, because its the interaction between the two completely different minds that is unique to only those minds.
But, what you can expect from a person that continues down the path of emotion is a boiling point. This is where the ratio would come in to play a part in telling you when that will happen. But, like what was said, The interactions between the minds is unique. Also, the circumstance of those two minds is constantly unique due to natural chaos which can not be forecast. The situation can always take a turn.
When the boiling point occurs that is when either you're a piece of shit, or the emotional is a piece of shit. This can also cross the threshold between: you(shit), me(shit) throughout the over-boiling procedure.(jokes from the eyes of a pessimist)
The point: If all this emotional interaction could take a back seat, people could flourish in there community and homes.