Does your parents over react on things when your an adult?

Generally, they did not overreact.

I simply don't tell them everything. If they don't need to know, why bother. them with it?

My grandma was a grammar freak, so would notice if I spelled it your instead of you're.

I used to see these in 90s, my aunt drank poison when she saw her daughter going out with bags, she thought she was running away from home. It was a silly misunderstanding. 

Nowadays, parents are equal crime partners

No, my parents have allowed me a fair amount of personal freedom ever since around high school