I love to drink milk from the carton
Why do you like drinking milk from the carton?
I'm a lazy person, and it's so much easier than using a glass.
It's gross to drink milk from the carton if you share it with other people. But as long as you live alone or are the only person who uses that milk, it's okay.
I share the milk with my roommates.
If you share the milk with other people then you should definitely not drink straight from the carton, but rather use a glass. If you want to buy your own milk that only you use, then it would be acceptable to drink out of the carton.