This is entirely plausible. If you are used to eating some food regularly over the course of decades, you will be able to discriminate between good vs. mediocre versions. If you have only eaten a food a few times, the most relevant comparisons will be with other types of food, and you won’t necessarily notice the difference between two separate experiences of it. When compared to pizza, tacos, or bagels, all scallion pancakes are pretty similar.
For instance, a person who drinks red wine every day will be able to tell you the difference between varietals, regions, distinguish $100 vs. $7 bottles, maybe notice good vs. bad years from some vineyard; someone who has only rarely had red wine might think that they all taste about the same.