Just a few seconds ago I went in my backyard & got some snow. I put it on a plate & used a "match" on the snow instead of a lighter. I struck the match & let it burn for a few seconds before putting the flame to the snow. I then held the flame to the snow until the match burned all the way down it's stick. when I smelled the snow it STILL smelled like BURNT PLASTIC. Why would that be ?Unfortunately it does not snow round here. I'd have to drive up the mountains. I wouldn't drink it after making it all sooty with the lighter though!
The smell is either coming from the lighter, or from burned gloves or similar. Possibly both.
The way it melts is explained in the OP