You can always just not argue with people and hear everything out, while presenting your own ideas. You're not morally obliged to argue with people over matters of personal taste I do find, when I run across a ship that I find completely baffling, that asking "why do you think that?" gets some interesting answers, as opposed to just going at the person with all the reasons why you think their idea is bad. Whether Megs is a full on malignant narcissist really depends on continuity and characterisation. In my favourite continuities he does appear to have some empathy and concern for others, but the urgency of his cause makes him forget them until in time he becomes what he once despised. But there are certainly continuities in which that is 100% a valid interpretation of him.