Hiyame
If the characters a villain... for the most part I believe the Author is already showing that negative traits such as being a racist is undesirable.
Which again at this point......... its honestly not so much the character so much as how the Author chooses to handle the topic if that makes sense. Like.. to tackle racism, the author certainly probably is going to need /racist/ characters for their story.. but there is a difference in sending the message of, lets not tolerate racism versus... racism is ok!!!
And while it certainly isn't 100% true that 'everyone' will see this character and suddenly undergo a transformation all "now I'm racist true!!!!" but it isn't 100% false either. But what matters is there is still a group of people that will be influenced by a character. As people can be influenced by their ideology when presented to them as a positive trait.
Judging by what the Admin said in their reply to you.... I'm pretty certain you are fine as you mentioned yourself, you don't put this stuff on TH and the stuff you do have is hidden O:
@GHOULONGTEA
From what I understand both aren't ok? So its not picking and choosing here. Romantic/positive portrayals of Pedophilia that present it as unproblematic are not ok in the same way Homophobic characters that are romanticized/positive things treated as problematic are not ok. (as promoting homophobia to be ok has had harmful effects to the lgbt community in the same way positive portrayals of Pedophilia have harmed victims of child abuse)
But As the admin posted in their response, they seem open to portrayals of Pedophilia done with tact. (which I guess boils back down to the sokka example so long as its not being portrayed as a thing people should be.)