Michael Schumacher's manager says Fernando Alonso has reacted badly to the situation at McLaren this season.
Willi Weber, who oversaw his seven time title winning charge's ultra-successful career at Jordan, Benetton and Ferrari, said Schumacher always acted correctly despite some fierce rivalries with teammates.
"Of course you always have your different views, but unlike Alonso, Michael always acted correctly.
"He simply showed who was the better one, and he certainly never thought of leaving the team if he was pushed hard."
Referring to Alonso, who narrowly beat Ferrari's Schumacher to the 2006 title, Weber said he "cannot understand" the Spaniard's behaviour alongside rookie championship leader Lewis Hamilton this year.
"I would have expected him to keep his cool and just smile and shift up another gear. But instead he loses his head and behaves the way he did in Hungary," Weber told the German Sunday newspaper Bild am Sonntag.
"And because of his behaviour his image suffers, which is actually the worse thing that can happen."
Weber said he would advise Alonso to put his head down now and do his talking on the track.
And he "must get the team on his side and under no circumstances close himself off to them".
"The fact that Hamilton does so well should not hurt his pride but instead stimulate him," Weber said.
"If I was Alonso's manager I would not be talking to other teams right now. Changing teams for him would be idiotic.
"He has the fastest car - what else does he want?"