As pointed out, we can't make a judgement on something we did not see, but from what you said, there are some things you should consider. Just because it looked funny or unusual does not make it illegal. There is way too much of that out there. Blockers can use wrist action to redirect or add velocity to the ball. You should always have a technical reason for a fault that you call. If it was caught, thrown, prolong contact - it was illegal. Now, all those terms are subjective. Only experience and studying other more experienced officials will give you a better understanding and your opinion will change over time.
Just because they are not happy does not mean you did not make the right call.
Once again. The uncommon may not be illegal. One hand sets, overpass saves, power dinks (tips), major roofs look "unusual" but (IMHO) are called illegal when they are not.
My response during a match: "Do you have a rules question? Ball handling is subjective and not open to discussion."
Don't seek out conversations about the match or calls you made except by other officials, hopefully mentors in private.
