What anctics are you referring to? being frustrated at his slow team mate holding him up while their rivals caught them? The majority of tifosi would have been screaming for Massa to get out of the way as well. Alonso is a classic tifosi driver. Fast, exciting and passionate, and that is why he is such a popular Ferrari driver already.
What antics? Really?
How about that after each of the last 4 races, Ferrari management have been in dispute with the race officials over incidents that Alonso was at the centre of:
After Canada - complaints about lack of blue flags / the new teams in general
After Valencia - Describing the race as "maniulated" and "a scandal"
After Silverstone - Press Release issued to contradict statements given by Race Control (not to mention contact between him and his teammate twice in one lap)
After Hockenheim - Ferrari personnel forced to make buffoons of themselves denying the undeniable. The team to be 'invited' to a WMSC hearing.
How about also that each of the last 3 teams Alonso has joined have been charged with bringing the sport into disrepute for events that occurred in his first season with that team.
In a way, both Ferrari and Alonso, are lucky that Massa has underperformed this season. Had the points tally between the two of them been closer going into Sunday's race, such that it would have been difficult to justify the 'switch' order, then we would have had an instance of the teams' interests and Alonso's not overlapping. We can only speculate as to what would have happened, history suggests it would not be pretty.
The tifosi will tolerate such antics as long as they are winning, should he fail to deliver (as he has done often in the early part of the season) he will become the scapegoat.