It's rude to snap at your parents.
Jason is having a discussion with is parents about his college plans, which his parents don't approve of.
Jason wants to put a quick end to the discussion.
Jason tells his parents he understands their concern and appreciates how much they care about his future, then changes the topic.
Jason tells his parents that the discussion is over and that he doesn't want to hear one more word from them.
Jason's parents feel their opinion is heard by their son and feel better.
Jason's parents are shocked and hurt by his curtness.