Address has been public
Your address where you are planning to send coins to has been posted publicly on an internet site. If your address where you are planning to send coins to has been posted publicly on an internet site, you need to consider your privacy to be somehow compromised and affected negatively, as more conclusions about your transactions can be drawn publicly, for example tied to a social media account or your Bitcointalk account.
Keep in mind: Bitcoin transactions are not reversible. Never. Once you've done a transaction and it’s included in a block, transactions are not reversible anymore.
As a Bitcoin user, it's wise to know the difference between a cold and hot wallet and also the importance of those two wallets. If a Bitcoiner is privacy conscious, he or she will only make use of their hot wallet for regular transactions like those connected to this forum, other frequent social media payments, and other regular activities that require the individual to spend some Bitcoin. But the cold wallet is specifically for holding some bitcoin without intending to spend it in the short term.
Privacy is quite important in the Bitcoin space.
Well, I think this is not new for Bitcoiners. As a Bitcoiner, whether new or old, the first thing to know is that any Bitcoiner transaction that has been sent cannot be cancelled.