Well if they’re anything like the Australian magpie, which are famous for being aggressive to cyclists in particular (late August to early October is their breeding season and thats when they get pissy), the best way to keep 'em off the back of your head is to fly a flag on a pole that extends up from your back wheel. Its not the most convenient thing to do, but it’ll probably keep the these blackbirds at bay.
And since nobody in their right mind would put a damned flag on their bike, Taiwanese may generally avoid you as well 