This should hide the drop downs and their carets if smaller than a tablet.

    @media (max-width: 768px) {
        .navbar ul.dropdown-menu, .navbar li.dropdown b.caret {
            display: none;
        }
    }

This should hide the drop downs and their carets if they are smaller than a tablet.

@media (max-width: 768px) {
    .navbar ul.dropdown-menu, .navbar li.dropdown b.caret {
        display: none;
    }
}