Answer:
egocentrism
Step-by-step explanation:
In psychology, egocentrism is defined as a person's inability to comprehend or understand the other person's opinion or viewpoint that may be considered as distinct than his or her own. Egocentrism represents or signifies a 'cognitive bias' in a way that a person feels or believes that the other person holds the same perception as he or she does henceforth, lacking the fact that the other person might have his or her own perspective.
As per the question, it appears that Ron has started to experience adolescent egocentrism.