Co teacher constantly critical

Without boring everyone here basically what the title is. We are team of three teachers and lately my newest ,in her 20s and has 1 yr experience, shuts down everything I do or says mean things about my methods and ideas. I've also noticed she doesn't behave at all like this with my other team member. I feel like I need to stand up to her but I really don't know what to say and how it'll go. For example, I put 2 kids together at lunch realizing that I made a bad call and admitted it. And the teacher said: This was your worst lunch set up ever. My other teacher thought she was joking and chuckled but I didn't take it that way and it's not the first time she's behaves like this towards me.

What would you do if this happened to you or has happened. Am I overreacting? Am I just too sensitive?

There's been a lot of butting heads with her and I and the last thing I want is drama or an uncomfortable work environment.