Well, Jesus did not welcome those who denied his being: Satan said, “If you’re the Messiah, then do something to prove it.”
“Begone, Satan, …”
And St. Peter tried to re-define Jesus’s person by blocking the road to Jerusalem, the road to crucifixion and betrayal, and Jesus did not accept this, did not welcome Peter changing his identity away from being the crucified sacrifice; “Get back in line behind me, you Satan.”
We follow “behind” our apostolic superiors and ignore the “opinions” of those who seek to lead us astray by contradicting our Catholic teachers.
St.Matthew, a tax collector and sinner, was welcomed by Jesus, but Matthew never tried to say Jesus was not the Messiah, never tried to lead you or anyone else to think Jesus was not the Son of God.
2 John was talking about lying teachers seeking to trick you.