People affilate themselves with those characters in levels they carry their pride like their own. I don't know, there are several reasons for that like how people lack self definition thus pretend they are linked to those characters like their own achievements.
This is the basis of my fave > your fave logic overflowing in base. They affilate success of fictional characters to themselves in order to lift their own egos, by saying things like "Sasky is jealous of Nardo" they reach the satisfaction in a way, because fhey "succeed" something.
Don't bother, type of people who link others' achievements to themselves exist everywhere. Like Insecure males who pick on how there are more men compared to women on certain businness branches they are insecure or lack achievements so they bicker about success of other men like their own, some people have nothing to be proud of so they bring pride over things like race, looks, ***, height, religion which are not apart of their achievements. NB is still filled with humans. Like the rest, they have pride over things which are not actual achievements.
In summary it is sad and don't even bother. The type of people you mention are extension of what we encounter everyday.