Well OP mentioned the sinless perfection doctrine for one that a couple on here, one main one, who goes around telling others that unless you never ever sin again in your life you will not receive salvation. Sinless perfection doctrine is just a bad doctrine that takes salvation out of the hands of the Lord and places it fully on the individual.
Then you have the other spectrum of the styles of eternal security (started by Augustine in the 4th century) and the osas (started by Calvin in the 1500's) doctrines that take and place it fully on the Lord and say we play no roll. When the bible says that how one walks in the faith, rather they continue to serve sin (flesh) or server righteousness (Lord) will determine if they have salvation.
Walking in the Spirit means the fruits of love, compassion, self-control, mercy, and such will be clearly evident in our lives. The bible says walking in love is what fulfills the commandments of the Lord, because love will uphold the teachings of our Savior showing that our faith and trust is rooted in Him.
If people do not follow the teachings of those men, but base their belief on the Lord and follow what He says in the bible we are to do then I have no issue with what they teach. But if they come in and start telling people their walk does not matter, they can live however they want, or even a backslide will cost them salvation that teaching has got to be shut down.
Which is why I posed those from any of those doctrines if they see another who believes as they believe; belittling, demeaning, using sarcastic remarks, and even condemning others they need to put those brothers or sisters in their place by the Word of God. As nowhere does the bible condone that treatment of others !!!