The teacher/student dynamic is vital in something like swimming where trust and respect are such core elements to learning. My son did poorly at swimming until this year, and now he wants to try out for the swim team next year! The difference is ALL in the teacher.

I watched the instructors working with other kids and then picked the who used positive reinforcement. He pushed my son but made him believe he could do it.

I personally wouldn't reinforce the rejecting behaviors by continuing.