There is a certain level or innocence or simplicity in the question. I've shown you a picture, and asked if you like it. What could be simpler?
But under the surface, maybe the qualifier is a little strong. There are no rules that require anyone to like anything, or about when or why it might be reasonable to have a certain opinion. (that whole free speech thing...)
There are a lot of reasons to either like or dislike a photo. The real question comes down to the criteria of judgment. And oddly enough (and quite often), you will have opposite opinions depending on the criteria....
This is not a new concept. Every decision we make is in relation to the set of outcomes that decision will create. I'm not looking to run down the rabbit hole on a deep philosophical idea, so let's get back to my question: "do you like this photo?"
When I produce photos for a client, they've hired me based on a recommendation, looking at my past work, and/or a conversation with me. During this evaluation period, they are mitigating the risk paying for something unseen. At the same time, I am evaluating whether I can provide what the client wants. I certainly can be technically proficient and make high quality images. But are they the "right" images?
This idea is very clear when I shoot professional headshots. The large majority of people tell me they aren't photogenic and don't like pictures of themselves. This is normal and doesn't change how I proceed, it's just part of the process. Making a subject feel comfortable is a necessary skill.