You see the problem is, that the Spanish have lived in a closed society for so long, that what they are told by friends and parents has to be true, and there is no way that it can be challenged, because what ever 'real knowledge' is, it's not the same as Spanish knowledge. Read and weep!!
"The confusion about 'fruit' and 'vegetable' arises because of the differences in usage between scientists and cooks. Scientifically speaking, a tomato is definitely a fruit. True fruits are developed from the ovary in the base of the flower, and contain the seeds of the plant (though cultivated forms may be seedless). Blueberries, raspberries, and oranges are true fruits, and so are many kinds of nut. Some plants have a soft part which supports the seeds and is also called a 'fruit', though it is not developed from the ovary: the strawberry is an example. As far as cooking is concerned, some things which are strictly fruits may be called 'vegetables' because they are used in savoury rather than sweet cooking. The tomato, though technically a fruit, is often used as a vegetable, and a bean pod is also technically a fruit. The term 'vegetable' is more generally used of other edible parts of plants, such as cabbage leaves, celery stalks, and potato tubers, which are not strictly the fruit of the plant from which they come. Occasionally the term 'fruit' may be used to refer to a part of a plant which is not a fruit, but which is used in sweet cooking: rhubarb, for example. So a tomato is the fruit of the tomato plant, but can be used as a vegetable in cooking."
So get over it, your wrong!