I know you're trolling, but I genuinely hope you realize that this isn't what people are upset about. It isn't that you can't comment on someone's ability to handle a second language, it's that you don't do it out of the blue and for no reason. It's like calling someone fat and then getting defensive and saying "but it's true!" when there was no reason to even bring that up. But maybe that example will be lost on you since you probably wouldn't have an issue with that behavior