Talmud: Part of this Machlokes is whether someone without Ne’emanus has Ne’emanus for themselves.
This Shaila is very Nogea L’ma’aseh at the Seder, by the way. If you have a guest who is a Mechalel Shabbos B’farhesia, can you pour him a glass of non-Mevushal wine or is it Lifnei Iver because he will touch it before drinking it?