Neither are you on TikTok, unless you actively go looking for it

That’s just genuine nonsense. The whole point of platforms like TikTok are the modern recommender systems that (simplified) lead to algorithmic radicalisation. Because these systems heavily optimise towards user engagement, they naturally spread misinformation and controversial content.
And because this kind of content statistically gets more user engagement as people commend on it and spend more time with it, it spreads quicker. This has also e.g. been confirmed by a leaked internal Facebook memo.

And additionally, these systems are personalised, so when you start to interact with it, you get more and more similar content. This leads to a radicalisation pipeline in which the platforms normalises these positions in echo chambers to you.