Gurgen if you think top level professional footballers don't care about losing, you have no idea what you're talking about. Competition (and an insane desire to win) is in their blood. I have an 11 year old nephew who can't stand losing a game of footie and will go out training in the backyard and mad all night whenever he doesn't play well or his team loses. Heck he can't even lose a game of ping pong against his little brother without it turning into a fight/argument.
If you think professional footballers who play for Arsenal don't care about losing to Spurs, pre season or otherwise, I don't know what to tell you. If even fans are widely disappointed, the players are feeling it doubly so. If they aren't, they really shouldn't be here.