I think the verdict is in. You're human. I have to admit that I once had an author stop writing, take down a story, then come back later with re-edits and posting ... and then, and only then, did I find out it was all in reaction to a comment I made that I felt was helpful but they felt was callous and condescending. I learned the same lesson you did, in much the same way.
That has not stopped me from offering my thoughts, and help, to many authors on this site and off. I do try to phrase things better, but I don't only focus on the positives or repeat what others have said to play it safe (though I had that urge at times). I've written this many times, but the best way to help a person is to mention what you like, why you like it, what you don't like, and why you don't like it. Be specific, back it up with thoughts and suggestions and try to keep your feelings out of it if you need to tell them a character is coming off badly, or not believable, or a plot event isn't remotely possible in real life, etc... I combine my thoughts as a reader and an author, but both viewpoints can be valuable on their own too.
All that being said ... GA is a pretty forgiving place with a healthy community. It takes all kinds of people to make the site work. Your first bit of a go at being a vocal part of that community might have been a bit of a rough go, but you can still be that type of member, if you want.