One of my sons came home from Yeshiva with an explanation about wine that I had never heard before. I know that I cannot drink wine if it is opened by a non-Jew. But he was taught to take it a step further, that if someone who is Jewish but who is not shomer mitzvot – ie someone who is not Sabbath observant or Kashrut observant – opens or touches the wine in some way, then that wine becomes “Stam Yaynom” – wine that an observant Jew is forbidden to drink.
Is this a chumra or is it halacha? Can anyone enlighten me? What about mevushal wine? Where does that come in? (their Rebbi told them to be careful, especially if they were at a seder where there would be non-religious people).