Who gives a rat arse about Laker fans or their opinions. They are the most fair weather fans out there. Where is a richter scale when you need one?
I remember TD being overtaken by Laker fans a couple of years ago screaming "MVP" for Kobe. I know those were Laker fans, but the fact that there weren't enough passionate Celtic fans there in the lean years to shout them down speaks to the fact that the C's have plenty of bandwagon fans of their own. I've never understood why people think that fairweather fans are unique to the particular teams. They're not. As a general rule, people are a lot more supportive of their team when they're winning.
As for Shaq, I don't have any ill will with him signing with the Celtics. I don't expect a guy who was born in Jersey, grew up in San Antonio, was drafted by Orlando, played in LA, Miami, Phoenix, & Cleveland to have some sort of allegiance to Los Angeles.