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Some Jews write "G-d" to avoid the possible desecration of his name -- which could happen if someone prints out the thread and later decides to toss it in the garbage. Now, not everyone agrees with this or believes it is necessary -- i.e. some avoid just writing the Hebrew name. That being said, however, I don't see why it is necessary to ridicule a practice whose intended purpose is to show some respect to the name of our creator.

Is it ok to point out silly superstitions that have no basis in the Word?

Consider this:

And you shall not profane my holy name, but I will be hallowed among the people of Israel (Leviticus 22:32)

you shall tear down their altars, and dash in pieces their pillars, and burn their Ashe'rim with fire; you shall hew down the graven images of their gods, and destroy their name out of that place.
You shall not do so to the LORD your God. (Deuteronomy 12:3-4)