How would you feel about people receiving citizenship in your country without really learning the language?

The background of the question is a post a few days ago in the Swedish subreddit where OP was asking a few questions about his pending citizenship application in English. Now, he did claim to speak "perfect Swedish", but I honestly find it hard to believe that someone would be very comfortable in a language when they chose to use a foreign language to ask a few questions. Am I overreacting or do you feel that a working proficiency in the language of the country should be a very basic requirement for citizenship?

For countries with multiple languages I suppose either one language goes or perhaps the main language where you live - I don't know.