Some people show off thier crypto assets without any typical reason while other need to show off that they have a lot of bitcoin and crypto and they feel unsatisfied until they know that all of thier family members and friends know that he has that much assets, Usually these are those people who will show off themselves to be rich and for this they won't be limited to showing thier crypto but also willing to show everything they own like car, home etc
Well, if you show your wallet balance to anyone, they can't steal anything from you but sometimes when other people know that you have that much balance then they may become jealous and think bad about you. Maybe try to harm you or anything like that, so for this reason i am that sort of person who won't be much interested to show off his assets to anyone.