I'd argue its largely to the manner of the win in the context of the season as a whole. It wasn't a season of great performances with the occasional disappointment, buoyed by the triumph of finally breaking our 17 year duck. It wasn't an indifferent season, salvaged by a great cup run with amazing nights and punctuated with great moments. It was an historically bad season in terms of the league campaign, filled with dreadful performances and an unflinching unwillingness to adapt to the pain, that was rounded off with a cup win that if we are honest none of us are going to look back at the actual performances and remember great moments individually other than the end result itself. There was no Ar5na1 for example or the final itself where we pummelled Chelsea (but didn't score as many as we should).
Add all of that and to another season where many of the same problems we have seen are present along with a whole raft of new ones and this season feels much like a continuation of the last 5 years, not necessarily in terms of style but in actual effectiveness. If we think of it in terms of wins and losses, especially at home nothing has changed or improved. I said this at the start of last season, each season is not in a vacuum divorced from what has come before.
Despite the EL win, last season was not a happy place and the fans expectations if anything have been reset to a higher point. There are those that felt that Ange had earnt another go at it and for them the current problems are obviously going to be given little time or sympathy, there are those that felt Ange should be fired for gross underachievement league wise and their expectations were for a rebuilt Spurs to actually challenge closer to the top of the table, again there is going to be little sympathy or room given by them for yet another manager unable to utilise his squad effectively. Then I think you do have to take into account this unrest is years in the making, years and years of poor squad building and poor managerial recruitment have left us as a fan base thats just largely unhappy with how we are run and the team will bear the brunt of that directly when the performances are so poor.
I don't think there is a solution to this other than winning games. Some will say playing better football will do it, but I think we are past that point now. The fans are not going to be happy playing great passing football that still results in losing 1-2 to Fulham at home. We need to win games at home as a minimum to win back the support of the fan base.