No, it's when you bomb the shit out of something so much that only glass remains. It's usually referring to nukes because they get hot enough to turn sand to glass.
Yes, but in reality nobody is going to nuke anybody, and certainly not because a random internet user vents their frustration at the situation with a clearly metaphorical and exaggerated request. Your reply was an overly literal reading of the comment, like replying to "go fuck yourself" with "...you realize that's not possible, right?"
I simply replied to your literal interpretation with a literal interpretation of my own.
My guy, you should stop feeding the troll. I can keep coming up with bullshit indefinitely. The intent of my original facetious reply was to point out how ridiculous it is to react to a clearly ridiculous and unrealistic suggestion as if it was the most seriously considered expression of an actual policy suggestion ever. But it turns out some people just can't not take every single thing that is said with the utmost seriousness.