I know this isn’t an AIBU, but posting for traffic (sorry 
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So my 9 year old Tom cat is a bit of a stroppy boy, but generally lovely to me. He doesn’t really like children though, I think he may have been mishandled as a kitten by children.
Anyway, about 20 minutes ago my DD was messing around with the living room door, keeping it wide open when she knows the cat isn’t allowed upstairs. Asked DD to shut the door, she refused so I raised my voice and told her to “shut the door NOW”. I wasn’t screaming, but it was more of a shout than a normal speaking voice. As soon as I did this the boy cat jumped off the chair and scratched/attacked the door (that DD closed just in time) really aggressively. This is the second time he’s done this, in pretty much the exact same circumstances. Was he trying to attack DD? was he trying to protect me because I shouted?
He’s not normally aggressive like that and it was quite scary!
Any cat owners on here who have an inkling of why he’s done this?