No, no, people can absolutely criticize art without needing any kind of special training. But I think it’s important to focus critique on either objective observations (the foreshortening on this arm is wrong, this pose is implausible, the anatomy looks off, etc.) or subjective assessments (“I don’t like the choice of colors, I would prefer more detail, this is too impressionistic for my taste, etc.) over blanket statements of quality (this sucks, it’s ugly, it looks like a 12-year old did it, etc.) Specific criticism over what you like or dislike and why, rather than treating your distaste for a piece as an objective indication of its quality.
Also, it’s off topic, but food is every bit as subjective as visual art.