That's what I wrote. The original comment received a question "Do you speak both languages natively?". While not aimed at me, I addressed it for the general case. People aren't brought up with both languages and will not have a native understanding of both. 6 years of at most 3 to 5 hours a week of French in high school don't get you to native level. I don't doubt at all that it's sufficient for your needs, but the bar for native is much higher than communicating without issues when dealing with work or meeting people. Even if you were at native level, it still wouldn't mean that this is the general case.

I hope the original poster replies as well, it would be interesting to know if he knows the history behind his last name.