Have to post this because it just happened to me.
Walking around Target with my mom (who is visiting us) and Little Bird (who is "off"). We were done there and walking toward the exit. I could hear a kid screaming from quite a bit away. A part of me thought, "ha! even 'normal' kids scream!!" Then, I saw the woman walking toward me with the little boy in the shopping cart. He was screaming his head off and she remained pretty calm and just walked along like she was trying to ignore him. As she got closer, we made eye contact. I was going to say to her in passing, "I get it. We've all been there," which I've said to other mothers in that situation. Sometimes you just need to know that you're not alone and that sometimes kids scream. But before I could, she shrugged her shoulders and she said to me, "He has Autism and he screams." I told her, "I get it. We have it, too." Then she told me that she hates how people stare and that she usually doesn't take him out like this. "I just can't take the stares." Then she said the worst part: "I have 4 kids. 3 of them have it." My heart sank and I got teary. I had to run after the bird and she was trying to find her daughter in the store so she could get the hell out of there. I wanted to hug her and to commiserate longer, but Autism doesn't give us much time for that. All I could say was, "I really get it." And I do.