How have they not made a sticky post on this topic so that it isn't made weekly (or even more often)?
And is it a non-U.S. thing? Because I've never heard someone personally complain that they didn't get a rematch at something.
To the OP: It isn't unfair. It isn't rude and it isn't required. No one has to rematch you, ever.
When it comes to live chess I would pretty much never rematch anyone, win or loss (at least not right after the game, maybe some other week). I play to play against different people and to play for certain amounts of time.
It means "break is over , have to go back to work "
It means. "I already beat you , why to play again ? "
It means. "Why to play to this dude agai it takes forever to make a move !!"
It means " Im sleepy "