more 班门弄斧

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I posted a short writing to an online forum

not sure if

I posted a short writing on an online forum

is better.

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called alt.chinese.text when there was a debate about pseudoscience among oversea Chinese students.

called alt.chinese.text where some overseas Chinese students were debating what is pseudoscience.

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It was an informal, casual follow-up to a discussion thread

a casual follow-up ?

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I never presented the criteria as my own original idea, nor did I copy your wordings.

I have never presented the criteria as my own original idea, nor have ...