Anyone who makes life unpleasant and difficult for you is "difficult". It could be your child, your spouse, your mother-in-law, your boss, a colleague, a customer, etc. Others may sometimes find you difficult too. So that is "difficult" for you. Now you understand.

When we say "kids are difficult" it means, generally, "hard to deal with." It is not just restricted to that though, normally it just means that they are not being reasonable. My mother would always say to me if I was being silly "stop being so difficult." What this means is "Stop being so hard to reason with." Or anything similar.

The word "difficult" doesn't just mean somewhat like "hard", or "not easy". It can also mean "full of trouble", "hard to handle/deal with",or "causing a lot of trouble", which is appropriate for this context.

Hi, to me this means 'difficult to reason with' or 'argumentative'