Sending a dish back to the kitchen because you don’t care for the taste is not acceptable etiquette. You should send food back to the kitchen for the the following reasons only:
1) It was not cooked to order. For example, the steak was rare rather than well done.
2) There is something “extra” in your dish you did not order such as a bug or hair.
3) The dish is not what you ordered. You ordered linguine with red clam sauce not white clam sauce.
4) The food is spoiled.