Do you feel it was really funny or mean of me?

Back in March 2017, when my 12th grade classes just started one afternoon after school hours got over, I was feeling very thirsty. My water bottle was empty because I drank all water as it was summer time. In front of our school there is a small bakery. I wanted to drink a Pepsi or Coca cola but I didn't have money. Suddenly I saw my class friend Sriram buying a Thums Up which is a soft drink in India similar to Pepsi or Coca Cola. I was so thirsty that I asked him to let me have some sips. But then he said me to have only 1 or 2 sips as he was thirsty too but I wanted to drink much more than that. But when drinking it, my mouth was touching the mouth of the bottle. Yes I have this habit of drinking water or soft drinks by making my mouth touch the mouth of bottle. He then said me "Idiot fellow" and then said me to have it and enjoy. I said him sorry and then he said "ok I will buy another one, enjoy." I was very happy as I got Thums Up for free and whats more awesome was that we were going to Siliguri and Falakata for vacations after 2 days.