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> I am kinda new to hackerrank and I don't know what it means when a comment is grayed out (it doesn't sound like a good thing)

This is hackernews, not hackerrank, and when a comment is grayed out it means more than a few people have downvoted it.

https://www.hackerrank.com/

It means this comment was heavily downvoted.

In this case the comment was originally at least five times longer than it currently is so many of the reasons for the downvoting are no longer apparent.

It means it was heavily downvoted. Others don't agree with us. That's okay though. At least I'm not alone!