My experience has been that emotions could be active reactions of thoughts. It is easy to fall into confusion, to understand when and why you might react to one thing, but not to the other, as the memories linger — episodes of statements, observations, declarations, and actions.
Personally, it stems mostly from experience and upbringing. If you were raised in an environment where verbal assaults and physical gestures were rampant, who is to say that you will not act the same way when raising your own child? Most of the time, human beings are easily led by their own experiences. While it is true that genetics affect human behavior, it is even more affected by how a child is raised; environment is the foundational need, which provides a blueprint to how a child should be raised.
Read more here:
https://medium.com/@leonbasin/active-reactions-of-thoughts-beb11ad6a514#.tco2idtvs