AITA for telling my sister she was never welcome at my wedding after she ruined my engagement?

This is going to sound dramatic, but here’s what happened. I (34F) have an older sister (36F) who has always been a bit… jealous of me. She has this tendency to always try to upstage me, whether it’s at family events or just in everyday life. When I got engaged to my now-husband (35M), I was over the moon and excited to share the news with my family.

However, my sister immediately turned the conversation to herself, saying she’s “still waiting” for her “perfect proposal” and that she’s been “waiting years” for the ring. I brushed it off, but then a week later, she took things to the next level. She went out of her way to undermine my wedding plans, claiming my choice of venue was tacky, my dress was hideous, and she even told some of my guests that they should expect a better wedding from her when she gets engaged.

I snapped and told her that if she couldn’t be supportive, she wasn’t welcome at my wedding, and I wouldn’t invite her. Now the whole family is mad at me for “being harsh,” and I feel like I’ve lost my sister over this. AITA for telling her she’s not welcome?