I don't know what seasons you've been watching but he does nothing but whine.
I'll name a few
"Felipe, Fernando is faster than you"
Hamilton overtook the safety car (which at the time he was in his right to do as it hadn't crossed the line on the track. Alonso then spent the next 7 laps complaining which made Hamilton get a drive through (which never affected the outcome as Hamilton was still ahead)
Australia this year he told his team not to talk to him for the last 20 laps
Numerous occasions in the last 2 yrs he has refused to do press interviews because he was upset with something.
So yeah his attitude has changed loads
Hamilton and others may complain etc but not to the extent Gonzo does. He is a very sore loser, thinks he is a better driver than he is (granted he is still very good) and the only reason he left McLaren is because they wouldn't pick him as the No.1 driver.
Your about the only person I know that actually likes him (although I think it may be love
)