Jesus’ tone to the Pharisees was defined by his authority.
You and I don’t have that.
Maybe try telling that to the Apostle Paul.
After all, he got in Apostle Peter’s face publicly - TWICE.
I do not define love by how nicey nice and ‘understanding’ we are in the face of evil, or my tone being seen as compromise with sin and blatant wrong doing. Neither does scripture.
We have authority to call sin and evil and wrongdoing what they are. We have authority to show people “this is the way, walk in it”. We have authority to urge the faithful not to abandon their faith or principles. You might see that as an unChristian ‘tone’, but I don’t.