It's my experience that those who exhibit little or no sincere interest in others (excpet, perhaps, for entertainment value) are, at a minimum,
inconsiderate. It often shows up when exchanging gifts (birthdays, etc.) when such people demonstrate zero comprehension of the individual tastes, interests, or preferences of the recipient. It shows up in suggested venues for socialization - restaurants, movies, etc. A generous and considerate person is
interested in others, not for appearances sake but out of genuine appreciation for the humanity and individuality of others. It shows up in the little unconcious behaviors ... looking around when stopping to converse, just to insure that others aren't inconvenienced bu where they stand. Inconsiderate people block aisles, doorways, and sidewalks as they pursue their own transient interests, clueless about the ways in which others might be inconvenienced. So, I watch for such behaviors - where 'attaboys' and back-patting don't motivate the facade of virtue.
I would also question whether my discomfort were a product of my own narcissism. To some degree, we all like folks to think about us - and treat it as a quid pro quo. I don't like thinking I'm "keeping score" but am sensitive enough to it that I know that somewhere in my psyche I react to imbalance.
I sometimes think of "Bronx Tale" and the advice given to our protagonist, Calogero, by Chazz Palminteri's character, Sonny, about women that are 'real deal' ...
Sonny: Alright, listen to me. You pull up right where she lives, right? Before you get outta the car, you lock both doors. Then, get outta the car, you walk over to her. You bring her over to the car. Dig out the key, put it in the lock and open the door for her. Then you let her get in. Then you close the door. Then you walk around the back of the car and look through the rear window. If she doesn't reach over and lift up that button so that you can get in: dump her.
Calogero 'C' Anello: Just like that?
Sonny: Listen to me, kid. If she doesn't reach over and lift up that button so that you can get in, that means she's a selfish broad and all you're seeing is the tip of the iceberg. You dump her and you dump her fast.
For me, this is iconic of "considerate" ... not for the credit but out of true, innate consideration. It's what we do when nobody's watching. It's what we do when we have NO EXPECTATION of being thanked - or even having our behavior noticed. That's when it counts.