I think Sam is embarrassed by Dave as she thinks she is better than everyone and he doesn’t fit in her circle and the lifestyle that she wants to portray, so distances herself and Dave is very straight talking so would probably tell them what he thinks
Where as Greg and Billie still seem to move in the same circles they always have and are down to earth and don’t try to portray they are better than anyone, love a good old knees up and don’t worry what the next person thinks
can you imagine Dave next to Mrs Jesus at a dinner party
that would be hilarious