I think we got off on the wrong foot, and now we're not sure what to do. Your son is young, and a little time to let tempers cool down could be very helpful. Then, when you judge the time to be right, begin with a positive, celebratory approach. The first step is to assess whether or not your son is ready, physically and emotionally, to be trained. And, each child's timetable is different.
Preparation is half the task.
Let your son get used to how the toilet flushes. Many kids are more interested in training if they've seen mom or dad use the toilet, so they know how it's done and that it's not frightening. Set aside a block of training time with relatively few distractions. Many parents find that training goes best if they make a concentrated effort on a weekend or some other time when a parent can be there consistently, approaching the task as a new adventure for the child. It's also helpful to check his pants every few minutes and let him know how great it is that he's stayed dry.