At a public building a small child was hammering the disabled door opener button with their hand, quickly and repeatedly - not for the purpose of opening the door.

I said "that's not a toy" as I walked by. The father got up in my face and said twice, "calm down". I was calm. He said "don't tell that to my kids". I said I was telling you. The reception told him to back off, he said "mind your own business" to me and walked away. I feel like was very reactive.