In my opinion, there's are two types of reality shows: ¶
1.

if there is more than one thing, use "there are" instead of "there is"

Reality shows, where people act like crazy idiots from Mars, who have never lived on Earth.

I have enough experience with average human behavior, so I don't need to watch the first one.

The 2nd one is too much for me so if I don't want to screeam after 2 minutes, I have to avoid it.

And reality shows have become even crazier because they have to shoot above average, so a vicious circle is being formed.

I'm pretty sure it leads to a disaster, a catastrophye, an armageddon or the worst combination of these.

Anyway, there could be reality shows that are good but I don't know them, so I acknowledge that my words can't be generaapplized to every reality show.

In my opinion, there's two types of reality shows: ¶
1.

Just a missing 's' on the word 'types' here.

Reality shows, where people act like real, average people.

Reality shows, where people act like crazy idiots from Mars, who never lived on Earth.

The 2nd one is too much for me, so if I don't want to screeam after 2 minutes, I have to avoid it.

Just a small spelling correction: scream, not screem.

And reality shows have become even crazier because they have to shoot above average, so a vicious cirycle is formed.

The idiom is "a vicious cycle."

Stylistically, I might simplify this sentence a bit:

"And reality shows have become even crazier because they have to shoot above average, so they get into a vicious cycle."