Your answer there was fine, but it's only fine to a different question - "My [person] asked me to cosign a car loan. What should I be aware of? What are the risks?"
The answer, after the fact, isn't helpful to the OP. And while I acknowledge that "because others might look at this for help" is actually useful, it would have been better to first answer the question as asked.
To be fair - there are many times we have this issue, new members asking for help after the fact, and we, I included, often give a warning to the future visitor but do little to help the OP. It's almost like you are saying "it's too late to help you, but let's try to help others from making this same mistake." Right?
All of this is separate from the Mod edit. Once GS edited the first answer, your line, using the same phrase, needed editing as well.
I'm sorry you feel this way. In general, I think we rarely make this type of edit in questions or answers. I know I've changed "your tax guy is a moron" to "you tax guy seems to have made an error" or similar, but not more than every few months, if that much.
We are at a point where I think we agree that "be nice" is something we'd like to stick to, but perhaps can't agree on where that line is. I'm in favor of a very low tolerance of ad hominem attacks and offensive language. I don't know how to articulate the line, but maybe to where we are as kind as we'd expect to hear one's 6 year old child speak. Is it acceptable if she came home and said "I got a C on my test, my teacher screwed me!" This is not "policy", it's an attempt to move forward in a way that's part of a community discussion on where the line is. I almost was going to suggest "The language you'd be comfortable using in your house of worship", which of course leaves out our valued atheist members, or "how you'd talk in front of your mother-in-law" which has its own problems.
And, no matter how we arrive at a reasonable consensus, we'll have new members who don't read the FAQ, Take the Tour, etc, as well as seasoned members who would interpret any guidance differently. We mods are aware of the gray area, and even with issues of what's on topic, often chat, and are sensitive to erring on the side of caution. When I see a meta "why was my question closed" I'm happy to look and see it was 5 non-mods who voted it closed. It means the system is working. There are other times we'll intervene quickly, depending on the issue.
It may be time to have a meta question on how to narrow the gray area of the line between kind and unkind. These are just my own thoughts toward that goal.