Well, the question says it all. In my opinion men are considered short if they are under 6'0. I don't know why lol do you agree? Not to sure about the woman one, I'd say a woman is considered tall if she's 5'7 or 5'8 ish and above
Way I see it, "short" means shorter than the average and "tall" means taller than average. So, then... to determine that, you should look at the average heights for people. What are the averages? Well... according to wikipedia... link
In my region people are taller than in the U. S. Average height for a woman is 171 cm (5 ft 7 1/2 in) and for the guy 185 cm (6 ft one in). So I'd say women 5 5 and under are considered short, the same goes for guys shorter than 5' 11. Woman are considered tall-ish if they are 5'9 and up but that's considered a great thing 'cause there is a strong cultural preference for tall women (probably because they're tall but still shorter than the guys).