I don't have a problem with it, either. The majority who do have a problem with it are fans of ring-less teams, unsurprisingly. Those guys seem unaware that many people pay thousands for tickets, or that an entire city's tax dollars are used to fund certain portions of the team budget. It makes perfect sense we get to claim the rings in the name of the team.
Now, I don't mean you can claim you did anything on the court, besides get loud outside of it. That's just stupid. Or acting like because your team won, you accomplished something extraordinary. A little perspective goes a long ways.