how are emotions a result of socialization

Although emotions undeniably have personal and subjective aspects, they are usually experienced in a social context and acquire their significance in relation to this context. Social processes affect the way in which our emotions unfold at a number of different levels. Now to list some example:

At the cultural level, what we define as an emotion, and what kind of emotion is appropriate in a specific situation, depends on the set of established values, norms, and customs within one’s own society.

For the group level, our emotions towards other individuals and other groups are affected by our belonging to an in-group with whose members we share a common social identity.

At the interpersonal level, other individuals’ emotions affect our emotions and our emotions affect them in an ongoing process of mutual exchange

Source:
"Emotions in Social Interactions: Unfolding Emotional Experience" by Claudia Marinetti, Penny Moore, Pablo Lucas, and Brian Parkinson
(Beautifully written article)