That's just how Kurama is. Still a nasty old fox but a good guy. Was impressed by someone reading him perfectly and putting him into a plan. But no, he isn't really mad or offended. He always talks like that.
Naaahhh just annoyed that Shikaku could figure out his power so quickly.It's not like Kurama suddenly likes all people.He just tries to help Naruto cause he believes in him.