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because those who look down on Arsenal are just jealous of Arsenal's performance and all they anticipated from Arsenal is to fail. However, they do not see Arsenal failing.
Why does it have to be about jealousy? I think fans are more logical than that. It's easy to see that Man City squad has more depth so a lot of fans put them above Arsenal. That's not to say that they are jealous.
Since Manchester City was fortunate enough to have earned a lot of points from their previous season's play, that season was significantly more favorable for them than it is for Arsenal.
Why are you trying to downplay their achievement last season to luck? They earned it and it's not their fault that Arsenal faltered or choked.