I
Also, the fact that Tweety Bird is a boy has always kind of thrown me off.
Blame this one on Warner Brothers' marketing department back in the 90's. they put Tweety on girl's clothing, but they also dressed him up in very girly clothes for quite some time because of that.
I knew, and always have that Tweety was a girl. In fact, they even mentioned this one an episode of Sylvester and Tweety Mysteries.