I can relate to that and it's really important to ask questions. Also it can be quite irritating when people try to look smart instead of being actually interested in the point.

On the other hand jargon is not an exact science. There are things like false friends, commonly incorrectly used terms and all that. That's why spoken language is usually spoken redundantly. Also sometimes the acoustic is bad and you don't want to ask 10 times a minute. Or the person says something incorrectly but you realize what the person actually means because of the surrounding context.