Is my teacher crazy?

Me n my friends were in class and she was rlly hungry so she took out a snack to eat and my teacher started flipping out and screaming at us and then my friends blood sugar was low and took a sip of juice and she got sent to the principals office and then I was trying to stand up for them I screamed at for “talking back” and then after she calmed down my other friend for laughing and for us having fun..