Classic menu is responsive if you go to Dashboard > PageLines > Site Options > Layout Editor and check "Disable Mobile View". Save your settings.
Quite often, sites look better on mobile devices without the mobile view enabled. My own site looks great on mobile phones, ipads, android tablets, etc. with mobile view disabled, but looks terrible with it enabled, no matter which menu bar I selected. It has to do with the site layout, images, dimensions, etc. Some things cannot be set to percentages or em sizes which ensure improved mobile view.