Or maybe they are sick of the same shit year in year out and are venting about the tiresome familiarity of it
Familiarity breeding contempt. But with the exception of people like Zim who has to be commended on his consistency if nothing else than the vitriol is most present when the chips are down, this is the same for all Arsenal fans.
People try to be quite even handed, few were saying this about Wenger when we won at home to United, City, Bayern Munich or Leicester. Because even though they fear the same thing will happen they hope as fans that this year just maybe it will be different and when it isn't it's a bitter pill to swallow.