Disclaimer: I am in no way a soccer expert nor do I play soccer; I am simply someone who enjoys watching sports and believes it is necessary to defend people who are like me.
I have found that during any sports event, not just the World Cup, many people get defensive about the sport like they are the only ones that are allowed to play, watch or talk about it. To these people I would like to say, get off your high horse. Any person is allowed to enjoy the beauty of the sport whether they know much about it or not. Sports serve to join people together, so that no matter the differences, you can sit side by side cheering on your favorite team. In events like the World Cup, it's about supporting your favorite team, that being your country's or any other. Why would you feel so superior as to shame someone who doesn't necessarily follow the sport for wanting to share that love for a team? Just relax and enjoy the game and let others do the same.
Now, that being said, if you are that person that knows little to nothing about the sport and are watching with knowledgeable people, good luck! I understand that you may have questions and are trying to better understand the sport, but no one, I repeat, no one will enjoy answering 50 questions whilst watching a game they are invested in. Save your questions for things you truly do not understand and cannot go on without knowing for the sake of your relationship with this person.