One way of avoiding criticism of some of the technical aspects of your work would be to strip out the EXIF then say that it was shot on film and the scan doesn't do it justice. You'd have to admit that you hadn't put any effort in presenting the image, but that might be preferable to admitting that your technique is less than perfect.
Joking apart, I find that a lot of criticism is based solely on the viewer's values. It's quite an effort to first try to understand what the photographer is aiming for. It is a lot easier to apply cookie cutter standards. In very few cases is there any attempt to discuss the photographer's objective, and whether or not that gets across. That's why I have a similar stance to JC1220's. If someone has a specific question about their work it is a lot easier to respond positively and in a way that helps the individual. Technical problems are often the least serious part of a photographer's work - they are easy to fix. An overall lack of direction can be harder to work on for both parties.
Those of you who are fans of 'People Like Us', a spoof documentary series on BBC, may remember the Photographer episode. Bill Nighy, as the photographer, gets an excellent, incisive, critique of his work. I'll have to transcribe it someday.
Best,
Helen