Some people, I notice, will suppress their emotions, not feeling them until later. After they have time to think, they experience an emotion they might not have had before and it could alter their attitude about something.
One emotion can be exchanged for another. If someone experiences something that makes them feel sad, they laugh at jokes instead. Maybe the sadness is too uncomfortable to bear so they replace it with something that is more soothing.
When I cry, it causes me physical pain, it irritates my skin, gives me a headache, causes my throat to hurt. It's very uncomfortable experience for me, so I would gladly replace that with laughing because laughter doesn't cause the physical unease. Perhaps others do the same thing but for different reasons. Maybe, some people have a genuine fear of letting others see them cry so they will do anything to not cry in front of people?
I see all people having conflicting emotions from time to time. It's like they don't know what to do with them so they try their best to sort them out.
Sometimes, they appear to not have them, to be callous and uncaring. Maybe they are conflicted and insecure at these times and are attempting to find ways to keep these emotions from taking control.
From what I can tell, people, in general, do not like to feel negative emotions but do like positive ones and will compensate with positive whenever possible which can, at times, cause them to appear callous and flippant ,perhaps even cold and unfeeling if they are footloose and fancy free when the situation calls for something dour.