It’s very relevant. Orange juice is not a necessity, it can be replaced with an alternate - water, apple juice, cola, whatnot.
Gasoline cannot.
You cannot pull into a gasoline station and say, “Hmmm, gas is a might bit expensive today, I’ll use diesel instead!”
Therefore, gasoline is an inelastic commodity. One will simply pay the price or go without. No choice.
Irrelevant. The discussion was on profits and what it costs produce a gallon of gasoline vs gallon of orange juice.