Baby Mama always belittling me?

I have to pickup and drop-off my daughter and when I do I try to be cordial and very quick as I just want to get out of the situation. My ex is always saying stuff to me like " you're a horrible person" etc. I honestly don't want to talk to her at all and I don't want to fight so I just don't say much of anything back but why does she do this kind of thing all the time.
Baby Mama always belittling me?
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