I don't get on well with my mother so I am not sure if this clouds my judgement.
She thinks my 6 year old is rude/talks back. I think she just can't handle anyone having a different opinion to her.
Sample conversation she thinks is rude:
She gives him a toy. It doesn't work.
Her: I got it repaired.
Him: it isn't repaired because it doesn't work
Her: but I got it repaired by our neighbour who is an electrician
Him: clearly not a good electrician
Now I can see he is being a bit literal and maybe a bit snarky but I think the main problem is that she's saying something incorrect. I don't think of it as rudeness.