In this case, you can use 2 wallets if you want. The first is public and the second is private and decentralized. By receiving to a public address, you send to an address that no one knows except you.
Wallets cannot be decentralized, either na custodial or non-custodial wallet, and all these talk of private and public wallet dey sound funny, lol, though i understand wetin una dey try talk.
If person know you for forum, still know you for real life, then dem fit know some of the assets wey you get through the addresses you post in the forum. If that one dey worry you, then when you accumulate in your address, you fit use mixer take send your assets to wallet address wey you never post for forum. If that one no dey enough, then you should prolly have kept your forum account and personal info separate.