It's always funny when people try to incorporate the anime logic with the reality.
In anime world, spirits are poor misunderstood souls who are just trying to be your best friends, so it'd be unfortunate for your parents to freak out.
In reality, besides their doubtful existence, many accounts of testimonies tend to describe spirits as evil and dangerous, so of course your parents would be freaking out if you interact with the ones.
Anime and reality are not compatible. I don't know why bunch of people here are trying to one-sidedly argue whether her parents are assholes or not.