Picture a person who has opinions, but then, after listening to someone with different ones, changes her mind. What feelings does that incite in you? Do you think she’s awesome for taking into consideration what others say?
Or do negative connotations come to mind? For example, what does it mean to be wishy-washy or a flip-flopper?
Your task is to place a character in a situation where his opinion on a given subject is revealed, then challenged. Perhaps one of the best ways to establish this is through dialogue rather than narrative.
In what types of social situations do people discuss issues that might create tension between opposing beliefs? That’s where your character needs to be.
Make sure that the discussion gets heated. Readers would get bored if your character isn’t passionate or doesn’t get agitated when challenged. Perhaps think about how you react. That might be a good starting point for your story.
Have fun with this one.