in my experience, reputation doesn't really show up unless the user has a bad rep.... they're marked by a few caution signs
related post: https://piefed.social/post/234177
also... for reputation: from source 1 - "The ‘Rep’ column is their reputation. As you can see, some people have been downvoted thousands of times. They’re not going to change their ways, are they?" from source 2 - "People who get downvoted a lot end up with a ‘low reputation’ indicator next to their name. You’ll know it when you see it."
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... might just be for Pixel users?