I consider myself an expert in food and hospitality, having been trained by top tier chefs and then managing different high end dining rooms over the past 35 plus years and now a personal chef.
I am not a picky eater, I can enjoy certain fast food all the way up to the finest meal in the finest restaurant around.
If a dish is prepared correctly with the proper(not most expensive) ingredients then it is a success. The problem is some people do not like how a dish may be prepared properly and then the word "subjective" comes in. I have also seen people order dishes that they want "customized". Then they complain that the dish was no good. Here are a few examples of that:
-Steak tartare to be seared on the outside, What????
-Steak Au poivre with no peppercorns, really????
-Crispy lamb chops, Oh boy!!
These could be examples of people not liking something and using the word subjective.