https://techcrunch.com/2022/09/23/tiktok-releasing-comment-dislike-button-all-users/

TikTok is rolling out its comment dislike button globally to all users, the company announced on Friday. The short-form video app started testing the dislike button in April as a way for users to identify comments they believe to be irrelevant or inappropriate.

If you click the dislike button on a comment, the dislike won’t be public and commenters won’t be notified that their comment has been disliked. Commenters and other users also won’t be able to see how many times a comment has been disliked. You can also take back your dislike by tapping the button again.