Why do you think Portland fans, fans of a long time staple of the NBA with a pretty rich history, wouldn’t be just as bitter as Sonic fans?
I’ve never heard of Grizzly fans becoming Sonics fans. but if that is the case, you’re talking about an expansion franchise that only existed in Vancouver for 6 seasons and literally never have one modicum of success in the entirety of their very brief run. It’s possible those Grizz fans who liked basketball were Sonics fans before hand or never really attached to the Grizzlies in the first place, no?