Okay.
First of all, Wiz, why did you tweet something like that? You're not aware that you're going to ruin someone's career. Taeyeon has a lot of haters and ppl will take that as an advantage to hate and hate and hate her! I understand that you have the right to be pissed off. But can you explain the rehearsal you had before MAMA? If she really is racist and rejected you she shouldn't had that practice in the first place!
Second, do you know her? Tae has problems with anxiety and insecurity. You don't know a lot of haters were even sending her threats, worse, death threats. So, I hope you think a million times before posting that tweet.. Third, MAMA is known for being a shitty mess when it comes to organization so most probably it was MAMA's decision. Because just like what I've said earlier, she shouldn't had that rehearsal in the first place if she really didn't want to. And I think Tae doesn't have that much power to cancel the performance especially with a big artist like you, but a company has.
Lastly, it is extremely unprofessional of you to post such dramas on twitter instead of just letting it go. You absolutely ruined someone's career..
PS. Delete your tweet and do something about the hella bashing.