If you don't like what you see on TikTok, you need to press your screen a couple of seconds, then select "I'm not interested". It takes a couple of hours before the algorithm filters all the content you dislike.
And when you see a lot of similar vidéos (a "trend"), use the "hide the videos with this song". Most of the time, all the videos from a trend use the same music.
(I only have videos of dogs and DIY...)