You beat sky toss by realizing/scouting that they’re going for that comp, and then you just take lots of bases. Win via eco. To be extra safe/seal win, you can mass a lot of spores. Things rarely go well when every time Toss has to attack, he’s attacking into a maxed army with tons of spores there and queens to transfuse things.
Given sky toss isn’t very mobile, you can basically always do counter attacks to buy enough time for your unbeatable eco to kick in or to get out an unbeatable comp.