Good call asking. It just clicked that my glass pots wouldn't work. I mean, of course they wouldn't, but I wouldn't think of them while stove shopping because I only rarely use them.

5 am rambling about why I have glass pots: I keep them around for a friend that keeps kosher and visits. My non-Jewish understanding is that different folks keep kosher differently based on different traditions. Her tradition is that glass doesn't pick up meat, dairy, or non-kosherness, so the same pot can be used for meat, dairy, or non-kosher meals, with washing in between of course.

Edit: and to make something explicit that I didn't know until I started ordering pizza with kosher-keeping D&D friends: there's a rule against mixing meat and dairy, so it's important to keep things with meat-i-ness and dairy-i-ness separate, because a dairy plate could transfer dairy-i-ness to a meat meal, which would make the meal not-kosher.