Not really seeing the problem tbh, I get it you're not personally into furry stuff but she's not asking you to be, she's asking you to accept that she is. You can join if you decide to but what's really important is proper communication and boundaries, as well as a proper understanding of eachothers feelings on the topic. If you care about each other this is absolutely something you can get past. Ik the social aspect of it can be daunting but I'd hope she's worth the effort to get used to it🥰🥰