Maybe he didn't like the videos like this: https://twitter.com/BlakePavey/status/1288818865846120449   

On the serious side, Trump is getting annoyed by this and that and he just thinks he will ban and everything will be OK.
TikTok (Chinese surveillance) is just a response to Facebook (American surveillance). So why just don't ban both?

All the news tell that Microsoft (yet another American surveillance giant) wants to buy at least the US operations of TikTok. Will Trump also ban Microsoft? Or he's just trying to help lower the price?