What I find interesting is the comment on "being a jerk" for not returning the salute.
Way back when I started playing with the big boys a <S> meant everything. Getting a recognition from the top sticks was an important measuring stick. It was also a way of nurturing "the code" and if you gave out a <S> improperly you didnt get silence or a lame uncalled for <S> with someone biting there tongue...you got a dressing down on text and you got your butt ganged for a week if needed.
Wow, so someone needs to be something special to have the "privilege" of giving a salute? What a bunch of arrogant, elitist drivel.

A salute to most is a simple and
short way of saying any combination of "good fight", "I had fun", "you did well", "congrats for pwning me", "nice moves", etc. etc.
If someone doesn't return a salute, fine, he may not have seen it, no big deal.
When someone salutes back or says "thanks", they are doing at least the polite and respectful thing, which is acknowledging the sign of respect someone has just given them.
To throw it back in his face like you said you did in your original post? Yes, compete jerkdom.
You might as well have slapped a stranger's hand away when he offered it in greeting. Or after a football game told the opposing team "you suck" instead of "good game." Very poor sportsmanship, indeed.