It doesn't take any clever parsing to see that if person A says "X is possible" and person B says, "No, you're wrong! It's not 100% certain that X will happen!

It doesn't take any clever parsing to see that if person A says "X is possible" and person B says, "No, you're wrong! It's not 100% certain that X will happen!" then person B is misinterpreting person A, either mistakenly or deliberately.