He who hates me hates my Father as well.
To hate Jesus is to hate the Father because Christ reveals God (14:9) and to dishonor Christ is to dishonor God (5:23). The opposite is also true (13:20).
John 14:9 Jesus answered: “Don’t you know me, Philip, even after I have been among you such a long time? Anyone who has seen me has seen the Father. How can you say, ‘Show us the Father’?
John 5:23 that all may honour the Son just as they honour the Father. He who does not honour the Son does not honour the Father, who sent him.
John 13:20 I tell you the truth, whoever accepts anyone I send accepts me; and whoever accepts me accepts the one who sent me.”
Both “me” and “my Father” are emphatic. Jesus doesn’t want there to be any doubt as to the seriousness of His rejection by the Jews.