sales clerk rude about our child

[Guest guest]

We had a very disturbing experience today that I feel moved to share with all of

you.  At the Dollar General store in Marietta today, our almost 3 yo son w/ASD

became fixated on finding the perfect alphabet letters (this is what he tends to

obsess with).  This escalated into him becoming very upset, crying and running

around the store.  Understanding that this may not be the most pleasant thing

for other customers, I immediately and calmly assisted him out of the store,

leaving my husband to pay for our items.  A female sales clerk said to the man

who was at the cash register checking my husband out, " If that were my kid, I

would beat his a--! "   She repeated this along with a few other unfavorably

opinions about our son after the guy at the register wasn't really responding. 

My husband, who normally keeps his cool, asked " Why, because he has autism? "  

She only responded with a " Well, I didn't know. "   No apology, no remorse....

Have any of you experienced anything like this? If so, how did you handle this?