I'll preface this by saying I have 3 children and the elder 2 are generally very well behaved. Fwiw I don't compare them.
The little one, aged 6.5, has incredibly challenging behaviour. Talks back, rolls eyes, tells me I'm a bad parent, hits me, shouts at me. I just tried to sit down for a cup of tea and I got shouted and and told it wasn't my seat. I ignored and have just got a mouthful of abuse.
6.5 is very concerned with what is fair or not, issue being that it's a skewed perception and 6.5 cant understand that yet eg if 6.5 and 9 each get a 5-minute turn at something, 6.5 doesn't understand that time seems to pass slower while waiting, and then complains it's not fair. Also misbehaves and lies about it.
Always has a smart answer for every single fucking thing. 6.5 just been told off for taking my seat and now said will cough on me and make me sick. Is now kicking me.
There's definitely a sensory thing there. Always seeking deep touch and sensations. Otherwise no sign of anything else at play.
I'm a secondary school teacher and if any of the teenagers behaved that like I would be horrified.
We try all the normal methods, reasoning, consequences, positive reinforcement, love bombing etc etc but it's getting worse.
What can I do?