Why would “dice sharing” be an issue at a game? [closed]

Tasha’s Cauldron of Everything, page 141 says the following (emphasis mine):

Common in-game limits include – but are not limited to – […]
Common out-of-game limits include unwanted physical contact, dice-sharing, dice-throwing, shouting, vulgarity, […].

All of these make sense to me, except for dice sharing. Why would people find dice sharing offensive? What about it would be offensive? Would it be forcing a player to use your dice, or forcing a player to share their dice? Or would it just be someone would be offended by you sharing your dice with someone?