You are being gross. You should disassociate the AirTag from your account.

You seem to insist that you forgot to take the AirTag off, and that leaving it on was an accident. Well, you now know that you didn't and, since you don't plan to retrieve it, shouldn't surveil it for your idle whimsey. If you sold your home and forgot to remove a few of your indoor cameras, is it okay for you to continue to monitoring the home? The answer is obviously no. What you're doing is not different.

Just because feds aren't knocking at your door doesn't mean what you're doing is not gross. I definitely wouldn't call it funny.