I’m genuinely disgusted…

My sister told my mom about my pregnancy in the most disrespectful way. My mom and I currently aren’t on speaking terms and my sister decided to start an argument with her while drunk and text her, “your baby is having a baby, wh*re.” Everyone automatically knew she was talking about me. Like that was so disrespectful and uncalled for. No one should find out about their first grandchild that way. My sister called me drunk and told me that she was jealous because she can’t biologically have children with the women that she loves because of her sexuality. She said that it should be her having my mom’s first grandchild and she also said this is the first time I’ve ever “upstaged” her….like what? I never knew someone could be so spiteful and envious. She purposely called me the “baby” in her text to my mom because she wants people to look down on me, but no one is because I’m an adult. This just isn’t right and I really don’t understand why she did that.