public freakout

So I was at the store a few days ago and Ashton decides to have a melt down!  Well I have ways of approaching him when he has a public freakout!  Then this woman I have never seen before comes up and tells me I should spank him and he wouldn't act like that!  First of all yes he would! Spanking doesn't help him in anyway shape or form!!  He is not wired like every other kid he is unique! Spanking would just make it worse! But this woman thinks she can come up to me and tell me whats best for my son! So as politely as I can manage I tell her that he is Autistic so maybe she will walk away!  No I was not quite that lucky!!! Instead she tells me that her grandson has autism and he never acts like that! I was absolutely appauled by this womans behavior!  Who does she think she is telling me how to discipline my son!  Unless she is raising her grandson then I really don't want to hear her advice!  And after almost 8 mins of pure torture listening to this woman she has to walk away because one of the kids she came to the store with was missing!! She wants to stand there and lecture me on parenting and she can't even keep up with her own! I was so upset when we finally gott to walk away! I told my husband "who the hell does she think she is" I couldn't believe someone could be so rude! But then again I guess there are those people all over!  First of all and I have stated this before unless you are the parent of an Autistic child then keep your parenting tips to yourself! You have no idea what I go through on a daily basis! So please keep your advice and your comments to yourself!!