Staff rude to customers

We with the kids and my husband at one Truworths, we've been their customers for a while now. My husband was buying shirts. While we were waiting my 3year old son was playing and sliding on the floor, one of their staff rudely talk to my son in front of me. I'm not saying my son must do whatever he wants but as a customer my son was to be treated with respect, he's only 3years old