It’s a good pun and you shouldn’t regret it! People who don’t get the joke are unobservant and can either realize and learn from their ignorance, or remain in the dark.

I only new fish, the shell, many people might be in the same situation

I’ve long assumed the authors of fsck were having some childish fun in choosing the name. Personally, I’d be fine with people routinely making asses of themselves by jumping to conclusions, and acting upon them. I’d even give them a chance to save themselves from embarrassment by putting an explanation in my profile “for those unaware.”