A point of fact is that the two data structures are different. There was even an article on the front page today about how minor changes to data structures can dramatically impact performance.
Anyway, my main point is that there should be a space to discuss the relative merits and issues of languages without it resorting to petty fighting, which even you and the OP and the other commenter are engaging in.
Please everyone try to use the principle of charity when reading a post on this site. There is a good chance the person you are responding to has a reasonable background and isn't totally ignorant. Instead of playing on pedantry, try to understand where they are coming from and understand a one-off post on an internet forum is not the strongest argument they could make.