Longbow
Self Destructoid
I think that's the point though, that there is no group behind Tahan. The bitching she's done has been very high school, and if others had joined in, then yes, it had the potential to become a bullying situation - except that no one has joined in. No one was laughing along with her imitation of Mikkayla, they all made it pretty clear they didn't agree with it. In a different series, with different housemates, she could have been a hate figure, but in this series she's been rendered benign by the other housemates' refusal to join in her bitching.
Mikkayla, on the other hand, does have a support group around her, she's not isolated, she's perfectly capable of sticking up for herself, and she's no angel herself. It isn't a battle of powerful against powerless, it's a battle of equals, or if anything, Mikkayla has the upper hand.
Very wisely put Master Pecan, these young Padawans will learn eventually.