what happens to Gregor when he leaves the room to meet the office manager? what does this episode reveal about Gregors father ?

Father becomes rather violent. He grabs a walking stick and a rolled up newspaper and tries to beat Gregor back to his room. Father hisses and shoos Gregor back much like someone might do to a bug or animal. Certainly Gregor's father holds no sympathy nor empathy towards his son. Gregor has merely been a breadwinner for the family. As a bug, Gregor is merely a pest.