My son's friends mother who I once considered a friend, during a craft project in my sons classroom, decided to tell my son that her son isn't allowed to play at my house because I have snakes. She also added that if she sees the snake she'd snap its neck.
I tried to address the issue. She replies to me that my son said it escaped once and it bites and it tried to eat the cat.
I replied to her that these snakes don't eat cats and they've never bitten anyone. They are in locked enclosures and dont have to be taken out when friends are over. I said that my son was upset and wasnt sure if he wanted to be around her because of it.

Instead of dealing with me within an hour his teacher is calling me saying if I have an issue then to address it with her because it happened at school. Then the teacher lectures me on the wisdom of having snakes and that every child gets the same amount of time to do crafts. Apparently this mother said I was complaining about that too which I never even mentioned. The teacher goes on about this woman who gives her time and art materials freely and that she's been doing it for four years... but she didnt ask me once what my issue was... only chastised me for bringing up this issue and defended the Mother.
I said I was considering making an official complaint and said that mother needs to watch what comes out of her mouth because it upset my son. She said he didnt appear upset that day. I said that's because he internalizes it and it came out later.
Now I'm at a standstill not sure if I should let this go or run with it.. Any suggestions?