Nothing wrong with having confidence at all but you showed an air of arrogance of that of a spoiled brat. Arsenal are still TOTL for a reason let's not forget, and although we are capable of thrashing them they are definitely capable of thrashing us too.
I don't know how old you are but are you old enough to remember Arsenal absolutely schooling us 4-0 at Maine Road in April 2001?
They were so good that day that i and several hundred blues stayed to clap them off the pitch. It's not as though we were bad, they totally outplayed us and scored all 4 goals in 1st half iirc.
As much as we have come to dislike Arsenal due to their expectant fans(like you; ) we should try and remain humble and magnanimous in defeat, and i think the majority of blues are who attended games throughout all the bad times of false dawns, shattered dreams and utter despair are still humble and magnanimous in defeat, or at least try to be because we simply cannot win every game and win every game by a cricket score.
One particular game at Maine Road(forgotten which) we were so fuckin' piss poor we got a corner and went mental as though we'd just scored. That was our way of amusing ourselves collectively back then because we were often too bobbins to get upset about: )