Unwanted Advice

So I was having a private conversation with a coworker in the breakroom about a particularly bad night.  Let just saw one of the kids tried to slug me and got spanked for it and got up from their short spanking and immediately said "that was fun" with a smile on his face, got spanked again later on when he repeated the offense, and to top the night off when I was restraining him from running away to play when he was supposed to be sent to his room I got tired of having him suspended mid air trapped between my knees (this was an odd arrangement for the restraining and when I went to put him down he hurt his foot.

Then this complete stranger who I've never spoken to before starts bursting into our conversation and telling me how I should or shouldn't parent, whether I've studied any child psychology, and that I'd better watch out cause I'm going to get in trouble with the law if I don't stop using physical spanking.  I probably should have said "excuse me, I don't know you, leave me alone" but I tried to be polite.  It was really obnoxious.

I guess it happened because I'm young and obviously stressed about it so random by standers feel the need to tell me what to do.  I've had other coworkers try to order me to force the bishop to get the kids into counseling, which given the time tables involved in whats going on just wouldn't be practical, they're leaving too soon for the bishop to do anything more than just say hello I'd like to get to know you.

I don't mind suggestions from people that I know.  I've actually gotten some really good pointers from people at work who I'm close friends with.  However, some people don't seem to feel any boundary between my business and their business sometimes.

Any suggestions on stopping do gooders?  I'm afraid the genetic dice are weighted towards Bonnie Jean and I receiving a lot more incidents like that in the future.