He was, and there were people clapping for him too -- but between the "hometown discount" fiasco (which I think was overblown, but I see why people got annoyed) and his saves record turning out to be as tainted as Bonds' HRs, he eroded fans' respect.
If you look at it another way, Dodger fans would have been hypocrites to boo Bonds but not Gagne because he's "one of ours."
Personally I won't boo any player, even Bonds, but I can see that logic.
The boos made me sad though. Other fans also expressed sadness about it. I suspect it's a mixed bag just as it would be if we played in Fenway -- Manny would get booed now, although there would also be clapping.
Not that I would class him with Bonds and Gagne. I think his talent is legit; he's just a slightly kooky primadonna. What a weird player to wind up a Dodger!