There was no reason for all that name calling still..I think it was so arrogant&rude. She could have just said: ..' You shouldn't give any advice on parenting after all that your own son has done..' Lachlan hasn't been my favourite character, he's been creepy, but recently he has changed for better and he is Belle's friend. He was just trying to help..
We know Lachlan hates his mom now, so he probably enjoyed every bit of it-Lisa taking her car etc.