Originally Posted by kennyc
It's am opinion.
In my opinion there's nothing wrong with the sentence (it's not only one sentence but anyway...).
If you re-arrange it to be: "Bad things happen to people when things get messed up, like they have with you." it is more obvious structurally and as a side effect, Word thinks it's just peachy.
The information is the same. Personally, I like the original version as I think that is more how a person would say it.
More to the point, would it stop a reader in their tracks because they would sense something wrong here and may have to re-read the fragment? Probably not and I think that is what matters.