So you can do something shitty and it not be immoral?
Sure, and I'm surprised you seem to think that would be notable.
Are there some things that are wrong, but not a sin?
Well, my morality isn't rooted in religion. I'm agnostic as to the concept of "sin", but if I'm recalling my parables correctly, I think the prodigal son did a bunch of "wrong" stuff, but I don't think the implication was that it was all sin.
would Jesus show the post to the person's manager?
I mean, I suspect not... Though he did flip those tables in the temple that one time, so today would he have doxxed the money-changers instead? Who knows 🤷♀️