Maybe they don't say it inside or in ceartain places because it might be cinsidered a disgrace. Also, the ring was only known to ceartain people. You don't want someone to overhear anything about the ring, because gossip can spread very fast. And also because of spies. Especially outside, there were many spies of sauron. And another reason, because it might somehow attract attention to the ring, which was one thing they didn't want.
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Do Not Touch
-Willie
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