My office has a half empty car park next to the office. We have been told our team cannot use it as staff from another nearby office don't have parking so no one can have parking (except the execs). Therefore, everyone struggles with parking. There is free staff parking 0.6 miles down the road though. Against company rules I have parked in the half empty car park. I didn't consider it a big deal as I wasn't taking anyone's space and when I couldn't find parking by the office I would use it.
Today, my Director spoke to me to say she had seen me using the car park and she is very angry. She found it disrespectful that I didn't follow a simple instruction and it is inappropriate behaviour. Therefore she will be issuing me with a letter of concern. I apologised and said I didn't realise it would upset anyone and that was not my intention. I accept I parked there when I shouldn't have and that's on me. She went on to say she felt it was personal against her instruction not to use it, and that I was giving her 'two fingers' and she didn't sleep the night she saw me it was so upsetting.
I accept I did wrong, but I am surprised she has taken this personally and feels that my exemplary three years service with no work issues counts for nothing and it's straight to a letter of concern. Am I being unreasonable to think this isn't a proportionate response? Is this a normal consequences?