Everyone has unique hobbies and skill sets, and that’s why people seem to excel at different things. It shouldn’t be important if someone is better at their hobby than you, but a lot of people are competitive and simply want to be the best, no matter what.
In this situation, a jealous man kept insulting his friend’s winemaking. He probably felt insecure that his own wine couldn’t compare, so he insulted the other man’s skills. He got taught a valuable lesson when his friend pulled a clever trick on him.
More info: Reddit