That is a disappointing answer. I was hoping for the truth, but got a poor attempt at humour instead.
I genuinely want to know the real answer, because this kind of behaviour confuses me. And every time I ask someone about it they don't answer, or get a non-answer like yours.
If HN blocked comments with certain words, I'd understand.
If you genuinely find shit an offensive word, and instead chose to use some other word instead, I would understand.