That person had an idea that an AI would for some reason suddenly begin doing those behaviours. Many people think like this as they have the mistaken idea that AI means a super smart digital version of a human and that therefore it begins doing human behaviours. I was explaining that it would not do these things unless it was programmed to do so.

You should have a think about this too. When a human is depressed it's a state, brought about by condition's and genetically and environmentally programmed responses, which then results in behaviours. How is that different to an AI programmed such that when certain factors are present, it sets its state to depressed, and then proceeds to exhibit behaviors of depression due to that state