I would say that you’re conflating two very different things. “I’m a rational person that questions biases and consults diverse expert opinions before making a decision” can be a strong opinion. Being a narcissist is different from having a strong personality. Actually, I’ve seen narcissists being very mercurial and changing themselves in order to manipulate others.

This goes both ways. Adulation is a common form of manipulation. This is how people fall for sycophancy all the time. Their ego gets easily massaged into compliance because of how vulnerable they are to other’s opinions. But any ways, this is an oversimplification, personalities are far more complex than a screenshot of a microblog entry can communicate.