Doraemon and Nobita were fighting because Nobita had asked for an artifact that Doraemon clearly didn't have

Nobita: Doraemon!! Lend me the artifact so Shizuka will fall in love with me!!

Doraemon: No!!

Suneo and Giant: They were behind Nobita and Doraemon What's wrong?

Shizuka: in the kitchen

When they entered they were surprised to see you, you were someone they had never seen before..