I'm looking for a name/category/definition of (personality?) disorder(s) that can be described with the following traits in one's (imaginary person) social/human behavior:
- this person brings up and emphasizes his own, (according to him) superior achievements whenever another person around him mentions their own success/results/etc. (relevant fact: this person's statements about his own achievements are usually true, so there is no or little exaggeration);
- still, this person does this in a way that likely hurts other's feelings or self-esteem (this person does this regardless of who's the other half, like friends/partner/family), maybe even permanently;
- when this person has to do something with the achievements of others, he also emphasizes his own role behind the success of the other half (may even claim that the other person would not have been able to achieve their results without his assistance/inspiration);
- finally, though this may be a bit further from the previous points, this person may also inspire other people to start doing the same things that he's already started earlier (through which he may have an edge in terms of performance, quicker results, etc.) - e.g., a hobby or a sport.
As a follow-up question: what would be an ideal strategy to deal with (from friends/family perspective) such a person's behavior (preferably in a way that noone gets hurt)? Note please that I'm not looking for an answer/advice related to any personal issues or situation, the above scenarios are strictly hypothetical.
As a 2nd follow-up question: I'd be also interested in the origin of such a situation/traits (like how one would develop such a behavior, e.g. through childhood events or parental issues).
My research so far: tried to look for an answer online by summarizing the main points and got to "Narcissistic personality disorder" which (according to this site) is a mental condition in which people have an inflated sense of their own importance, a deep need for excessive attention and admiration.
However, I'm not 100% sure that the above traits completely match this definition since they emphasize one's superior results/role in other's success and usually are combined with mean/humiliating remarks. Also, this person rarely steers a conversation etc. in a way so that he'll have the attention/focus.