"Sardarji in a logic school" joke

Sardarji went to a logic school to learn logic. "To begin with, I'll explain you the term logic with the help of an example," the Professor said.
"Do you have a fish pond?" asked the Professor.
"Yes," said Sardarji.
"This means you love fish," the Professor continued.
"Yes."
"That is you love water."
"Yes."
"Everybody drinks water, meaning you love everybody."
"Yes."
"This means you love a boy."
"Yes."
"So you love a girl."
"Yes."
"If you love a girl, then you are a boy."
"Yes, I am a boy."
"And if you are a boy, you are not homosexual."
"Yes, true, I am not a homosexual," said Sardarji.
"So this is the logical relationship between a fish pond and homosexual," the Professor ended.
That night Sardarji could not sleep well and wondered regarding the logical relationship between fish pond and a homosexual. Next day, on his way to the logic school, he met his friend who inquired about his first day at logic school. Sardarji said proudly, "I'll explain you the term logic with the help of an example."
"Do you have a fish pond?" asked Sardarji.
"No," his friend replied.
"Then you are a homosexual," Sardarji concluded.