I get this all the time, and while it would be foolish of me to try and argue with you about it ( because I simply do not have the first hand knowledge you do ) I guess I just dont understand why that is.
I consider myself a well rounded sports fan. I could go on for hours about anything from MMA to Basketball to Volleyball. And to my knowledge, there is no sports related rivalry between Sacramento and Anaheim. NY and Boston has such a rich sports history in every major sport .. Jets vs. Pats, Yanks vs. Sox, Rangers vs. Bruins, Celtics vs. Knicks... And a huge part of all those rivalries is the "New York" in the name. I dont think its the state of New York, but just the name "New York".
There is little to no rivalry when it comes to the Buffalo Bills, or the Buffalo Sabres. I guess there is a little something there, but nothing like the teams with "New York" in front of them.
To my knowledge, the big Sacramento rivalry is more of a NorCal vs. SoCal thing. Which I totally get. And I understand Anaheim is a SoCal city, but I feel like its more of a "Buffalo" then a "New York" if that makes any sense at all. Now, if the team moved to LA I would agree with you 100%. Thats a Boston to New York move, because you have the territorial rivalry of NorCal/SoCal and a sports rivalry of LA/Sacramento.
Just to stay on the move topic, sure, I would hate it if a Boston team moved to Buffalo (or anywhere outside of MA) but I would prefer Buffalo over New York City. And I would prefer Buffalo over somewhere like Texas or Florida (or any equivalent to Kansas City). because at least it is closer.
If I sound totally ignorant I apologize to all the Sacramento natives, but this is just how I see it.