I let my 7yrold son and his friend watch Friday the 13th and now the friend's mom is mad at me. Wat did I do w?

what did I do wrong? Maybe I should have consulted her first, but I just umed that it was okay since i had shown them othe rhorrors movies like saw and texas chainsawmacre before. she has been leaving me angry phone messages non-stop all day and now all of my other friends are emailing me and telling me that she sent out nasty emails about me. is she just crossing the line or what? Id understand a little bit of frustration but she is acting like a maniac and insulting my perenting skills.