Emails!!!

I just received an email from an angry parent, blasting me for poor teaching.  EEEEK!  Not that I'm perfect, but this student (10th grader), doesn't hand in all of his assignments, does poorly on tests/quizzes, and flat out lies to his dad.  He's actually a pretty smart kid, but that's sort of what gets him in trouble in the first place.  He won't shut up in my class.  He always has to have the last word.  I  spoke to his web design teacher, and he says the same thing about his talking out, but he's getting an A from him.  He's getting A's from most of his teachers (not me). I emailed him back and told him it was offensive to be called a poor teacher, and if he wanted to come and observe my class anytime, he was welcome.  When his kid came to class today, I questioned him about what he told his father, and he wanted to hand in work he told his father he had done.  Yeah, he had done them alright, AND I had recorded it in Powerschool.  It really bugs me when a student lies to their parents about school (me in particular).
I find that people (parents) find it much easier to slam you when they are emailing you.  I had this happen to me a couple of years ago with one of my Debate Students.  Boy could she yell!!