Some, mainly Ashkenazim, hold that glass dishes must be separated between milk and meat. Some, mainly Sefardim, do not. May the former eat on the latter's glass dishes?
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After-the-fact, Ashkenazim rule that glass never "treifs" up food. The question is whether I may go eat at his house in the first place, is that called "choosing to use glass dishes"?
An easy way out is Rabbi Moshe Heinemann's view (shlit'a). From the Star-K:
In other words, even Ashkenazim may use the same glass plates, as you don't bake directly on the plate (it's used as a kli sheni). So you're fine unless you know your Sephardic hosts put their Corelle plates in the oven, or use the same Pyrex baking dishes for both meat and milk -- unlikely.