The majority of instructors are good but, yes, there are some out there who are on a bit of a power trip.
You are the customer, so ask for what you want.
If harsh words and constant put downs erode your confidence, change instructor. On the other hand, some students are spurred on by that kind of negativity - makes them determined to prove the b*****d wrong!
Some personanities will never gel, so if it's not working out, change it - too much is at stake.
I changed schools midway and I know several others who did the same.