How does tik tok still have this up ?

Because they don't care about immigrants

I know it says he got harassed but what happened in the video exactly? 

'harassing', when they just happen to be customers at the same establishment. bigots try so hard to make themselves out to be the victim lol. but to answer your question, the app is turning into yet another bigot-filled cesspool, especially after the temporary ban. and the moderation is done with shitty ai now, which does not care about bigotry at all, in fact, it LIKES it and encourages it...so...there's that.