Why is my boyfriends mom so mean, when I was always nice and respectful to her?

When I walked into their home, she introduces me to her friend and then I go in the room and hear her say "blah blah blah, she's not pretty". And then recently she will laugh at me for not knowing how to speak my native language.
Why is my boyfriends mom so mean, when I was always nice and respectful to her?
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