Who does Shayne have receipts on?

I just watched the season two LIB reunion and then immediately went to the IG stories of all the cast members to see if they had any responses to what was shown and Shane posted this cryptic story saying he has receipts! https://www.instagram.com/p/Car-95KFGX2/?utm_source=ig_web_copy_link

During the reunion he definitely seemed upset any time he and Shaina were mentioned, so I feel like it has nothing to do with the two of them as he has made it clear there never was and never will be any romantic relationship and it seems he wants to be removed from that narrative entirely.

He did butt heads with Shake during the reunion so I wonder if the receipts are about him? And if so, can we please see them?!?