Is my swimming coach too strict and unreasonable?

I am currently attending Masters swimming sessions at a local swim club. The coach appears to be a strict, no nonsense coach and will not hesitate to chide and yell at swimmers who can't perform a drill properly. For instance, he lambasted at me and said I was a terrible swimmer when I performed poorly during the drills. I am new to Masters swimming so my hand and leg coordination is not that good compared to more seasoned swimmers. Furthermore, he did not allow me to go to the restroom and even forced me to finish a 500m set with a full bladder before I can even think of leaving the pool. Is my coach being too unreasonable? Should I switch to a more lenient coach? I have to admit that my coach is excellent in correcting one's stroke and provides tons of useful tips. He will also praise swimmers for their good performance.