My MIL is out to get me

Good day house, please I need advice from you. So the kids grand parents were over and my husband's mother whom we have never really never had a chance to get to know each other well came to meet me in the kitchen, and we were alone, she got really aggressive with me she said and I quote "I just want you to know from the bottom of my heart that since the beginning I've hated you and the worst thing that ever happened to my son was meeting someone like you." Then she just went back into the living room and was all smiles with everyone like nothing happened. Long story short she implied that she's always seen through me and doesn't care that I love her son. I mean I get it I'm not a saint I'm not some perfect wife or whatever the ideal woman is supposed to be but I'm trying to do better and do right by my family yet most just judge me for my past. I had a terrible past but my husband knows all about it and he has sworn to love me with my flaws. Should I tell my husband what his mother said or just let it go? I keep thinking if I do I'm just going to be opening myself up to more moments like this and I would rather her just openly say what she thinks rather than just act nice and then insult me in private.