K.W.
I understand your feelings & have seen this happen to my own children (7,5,3).
My 3 year old -- mostly -- he does tend to enjoy talking to adults which I don't mind since I am with him. I have to say that I have probably had adults ignore my children, but then again, I know that sometimes I am in a "fog" and don't realize when another child is talking to me.
Sometimes I catch myself and, of course, praise the child -- but other times, I am either concerned about my 3 yr. old across the room or where are my girls (if I have them all with me) -- or mentally disconnected for a moment thinking about where I have to go next or what I have to finish for my evening part time job.
These are excuses, yes, and to be rude -- there is no excuse.
So I apologize, wholeheartedly, if I have been "tuned" out when a little person is trying to connect.
And sometimes, I think, when I watch it being done to my own children -- the mom just has no clue. She has a million things on her mind & doesn't see my little one trying to talk to her. Or she's half having a conversation with the woman next to her.
Basically, I respond to my own children & have compassion for the moms who are either tuned out (how I am sometimes) -- overwhelmed -- or just not purposely being rude -- yet they are being rude.
Lots of compassion helps since I know I need all I can get in return. You being a teacher of children with autism -- I'm sure you have boatloads!
p.s. I know sometimes when a little one talks to me & I am tuned into the moment -- I worry about the whole "stranger danger talk" I give my kids -- and wonder if the mom will be annoyed with me for engaging her child. Weird thought -- I know.........but I have had encounters with moms where they have been annoyed at me when at a park -- and I see no mom around and I tell a 2 year old in a nice voice (of course) "no sticks" "please put the stick down" (having seen sticks poked into eyes).....the mama bear steps out of nowhere & tells me she allows her children to play with sticks (happen to me twice -- two diff parks)......and then we move to the other side of the park. Weird stuff is everywhere.