How can you prove...,

[Silverobama]

I was arguing with a woman in the comment section. Some posted a video about his son kept saying good words and bad words to two bowls of rice. Ten days later, the good-word rice is still fresh while the bad-word rice turned rotten. A woman said "This is fake science". Then I asked her "How can you prove that it is psudoscience?"

Is my question natural?

 

[emsr2d2]

Recently, I was arguing with a woman in the comments section of [name/description of website].

You really need to start using some sort of time marker in all these posts that start with "I was" and similar. You can't just say "the comments section" without expanding on that.

Someone had posted a video about in which his son kept saying good words to one bowl of rice and bad words to two bowls of rice another.

See above. You needed the past perfect at the start to show that posting the video came before the argument.
Saying that he said "good words and bad words to two bowls of rice" didn't make it clear that he wasn't just saying all those words to both bowls.

Ten days later, the 'good-word rice' is was still fresh while the 'bad-word rice' had turned rotten. A woman said "This is fake science". Then I asked her "How can you prove that it is pseudoscience?"

See above. You could have said "was rotten".
Again, I've removed "Then" as the first word of a sentence.

Is my question natural?

With my correction to the spelling of "pseudoscience", it's OK. You could have simply said "Can you prove that?"