This is what I could find, from a previous Grackle thread:
"Honor had a private instagram and an open twitter page where she posted some anti BLM and homophobic content (I've seen screenshots, no idea how they came about or if they're still circulating). Grace had liked a post that called gay people 'sinners who choose to be gay'. There are a few other claims/rumours that were thrown around on another chat site about a year ago. Someone claimed to know Honor from school and she was the popular girl who bullied others. They did know the name of the school so it seemed somewhat legit. There was also someone saying Honor found out someone in her friend group had attempted suicide, and she proceeded to send them death threats and 'tips'. There were screenshots but they and the post were taken down quickly as it was against that site's rules."
It's hard for me to be sure it's all true without seeing the screenshots or old threads that were deleted. I wouldn't be that surprised but I am not going to just take it as fact either.
I was going to look at who Grace follows on IG to see if she follows many LGBT people but she follows no one at all. I know she definitely used to follow people. She must have unfollowed everyone because she didn't want people looking just like I tried to