I think this is a ridiculous question, bordering offensive. I was at a smart dinner with a friend who was brought up speaking Welsh as his first language in a very Welsh speaking area.
We got put to sit near a friend of his and her acquaintance. For background, this girl openly admitted that the only time she had left London for Wales was to visit her friend’s holiday cottage in West Wales. She is very bright too, and studied... languages.
Anyhow conversation is moving on, and she turns to him and asks him about his upbringing etc, and after him explaining the above, she asked
“So, you speak Welsh as a hobby?” 
Do French people speak French as a hobby? Is your hobby to speak the language you think in? 