Grandson is a nightmare to look after

My six-year-old grandson stayed over and he was an absolute nightmare from start to finish. Walked through the door shouting, kicking off, giving me filthy looks. In the car he when we were taking them home he blasted music full volume just to get a reaction, and when I took the iPad off him he screamed in my ear so loud it actually hurt.
He’s always been like this, probably since he was around 3 years old.
He’s ok with my hubby, his Grandad, still a challenge but with me? Totally different story. His sister (she’s eight) even came out with, ‘He doesn’t like you because you’re mean.’ All because I’ve got a few basic rules — nothing out of the ordinary. The minute I said that, he kicked off again.
He actually knows what he’s doing, as in school he well behaved 😞
And I’ll be honest… I’ve had my own kids, helped bring up my little brother, looked after nieces, nephews, and a whole load of kids over the years. I’ve never met a child I couldn’t deal with…until him.
He’s the only one I genuinely struggle with, and I’m finding it really hard to even warm to him.
His sister has a lovely fun nature, loves a chat, he makes her upset, as sometimes he’s like this at home, definitely a challenge for his poor parents 😔
I’d love to have more sleepovers for them, but I really can’t cope with my grandson.
Has anyone else had a grandchild like this? I feel awful saying it but I’m completely out of ideas.