The message from the troll began: "Do you still fantasise about girls when you are indulging in adult fun? You f***ing lesbian f**k bandwaggoning from one gender to the other."
A frustrated Brooke wrote next to the post: 'Comments like this,' followed by an angry face emoji.
The shameful comments come after viewers watched her and Alex Nation share an intimate kiss on the Bachelor In Paradise.
After their kiss ended, Alex who was clearly blown away by their passionate kiss said, "Holy s**t this chick! The energy is just so intense. We feel it from head to toe. It gives you goosebumps".
Before their date, Alex admitted to the camera that she is very attracted to Brooke and that they have a serious connection.
The former Bachelor star said "She's such a little hottie, she sucks me in. Her eyes just draw me right in."
Sadly after Alex found herself gaining deeper feelings for Bill Goldsmith, she told Brooke that she wanted to close that chapter of their relationship but would love to stay friends.
Brooke officially exited Bachelor In Paradise on Thursday after voluntarily quitting the show and finding love outside of Fiji with her new boyfriend!
WATCH RELATED VIDEO: BIP: Brooke walks out of Paradise after being dumped by Alex