Behavioral change is common depending on the mood or what happened to your day and not just related to gambling. There times that you'll win or lose in gambling, there are times that you are happy, irritable or frustrated, but it's important to be aware and of these behavioral changes and potential impact on ourselves or those around us.
I think the OP is taking about gambling and how it can have an effect on your behavior. Aside other factors that could affect your behavior, I think gambling as an activity could have quite an effect on the behavior of individuals.
Like the OP noted, people cope with wins and losses differently and those emotions could then have a spill over into other aspects of our lives. Imagine a gambler who’s on a losing streak and his finances being in the red, tat person would likely be frustrated and would have a not so pleasant interaction with others.