You obviously have not read the entire Book, my FRiend. Paul's admonitions were to believers, between believers. The RCC does not present the Gospel of Grace in Jesus Christ, but a religiosoty derived from traditions and doctrines of demons. The sacerdotalism, the indulgences, the sacraments, the mariolatry, the genuflecting, the absolution of sin, the papal heresy is all part and parcel of an enormous errant "gospel". To call it out is not only kind, but necessary.
If you saw a child standing in the street with a bus coming, would you see it too strident to scream, "Get out of the street!". Consider this the scream. But, of course, they will get out of the street only if God grants them so.
I guess some people enjoy living in the flesh.