Kyle is saying: ‘Shut up or I’ll punch you in the teeth’ in Scottish.
Scott’s ‘Ey ey, calm down calm down!’ is a reference to The Scousers. :>
Kyle still speaks Scottish (Glaswegian) when he’s around his dad, or at family gatherings when he’s speaking to Scottish family members. When he speaks normally, he has a hint of an accent, but most people don’t even notice. (his mum’s English, so he was always able to speak however he preferred)
As you can see, Scott and Kyle like poking fun at each other for being Scottish/Scouse. :B