Partner Starting To Express More Fatphobic Views

At the beginning of our relationship over a year ago, my current partner really listened to me when I explained what it feels like to be fat, especially growing up fat as a little girl. Being told constantly I wasn't good enough. The internal disgust I felt. I explained that even now I sometimes struggle with extreme shame. She actually listened. She cared and really made sure I understood that she would never treat me like I needed to do anything with my body I wasn't comfortable with. Including losing or gaining weight.

She's always been more fit than me. She's a trans woman so she's always been more focused on fitting her body to a transition goal, which includes a degree of muscle strength and physical fitness. I genuinely am happy that she feels happier in her body. She's never been fat by any stretch but she is getting more muscular. She's always been strong, but now she's even stronger than she was before she transitioned.

I've noticed she's started to refer to other women that annoy her as "whales" and men as "walking heart attacks". She's started to treat fatness as a point of attack on other people. She keeps commenting on whether or not her teammates at her job are "fit enough" for the job (her job requires a significant amount of strength and cardio conditioning). I tried to bring it up to her that these comments are fat phobic and even if she's not saying them to their faces, she's saying them to me. She keeps saying that I'm nothing like them. That I'm beautiful and intelligent. I just can't seem to explain to her that it doesn't matter if she doesn't see ME that way. It's wrong to see anyone that way.

I love her. She loves me. I dont want this to be the issue that splits us apart. We live together. We are raising pets together. She told me she's planning a proposal. She's genuinely an amazing partner who cares for me and supports me in everything I do. I just dont know how to react to this.