The staff member IAN is the rudest person I have e...

The staff member IAN is the rudest person I have ever been in the presence of.
I asked him a question to which he raised his voice yelling at me if I don't like their system he can cancel my order and I can leave... I was absolutely gobsmacked, was completely uncalled for. If it wasn't for travelling to get there and for my 11yo's birthday, I would have done just that.
The Manager brushed it off saying he was stressed.
- To Ian I say 'not everyone is looking for a fight, life might that get easier if you realise that."