"They warn you to stay away from false teachers! Even the scriptures don't do that"
But you did say it was opinion: "a friend of mine for his opinion, which i respect."
Rom 16:17 Now I urge you, brethren, keep your eye on those who cause dissensions and hindrances contrary to the teaching which you learned, and turn away (avoid, shun) from them.
2Ti 4:15 Be on guard against him yourself, for he vigorously opposed our teaching.