I have literally never heard anyone who has worked with her say a bad thing about Hyuna. I have literally never heard anyone who has worked with her say a bad thing about Hyuna.
For all the 'bad girl' concepts she has done, she's an actual angel in real life and here's just one example:
On a show a long time ago, Hyomin from T-ARA was a regular guest. One day while Hyuna (who is close with Hyomin) was a guest and they started talking about food and how much Hyomin eats.
The topic came up that Hyomin's CEO told all of the T-ARA members to starve themselves before their Bo-Peep promotions in order to look skinny in the outfits.
Hyuna immediately jumps in and says 'the ceo is a bad man' and directly addresses the ceo about how starving girls if screwed up. She then offers Hyomin to come to Cube where 'they give us food.'