Part of the point of them is that though you can agree that they are pretty much all twats, you can probably identify with them. As a teenager, you were probably at school with people like this. You're supposed to laugh at them, but also remember what it was like to be that age.

No, you're supposed to be laughing at them. They are an exaggerated collection of stereotypical teenage anxieties about sex and growing up synthesised into a motley crew of adolescents. They're not real and you're not being asked to sympathise with them. Occasionally you might identify with how they behave or think, but generally it's a picaresque comment on modern youth.

What country are you in? I cannot find this movie on netflix.

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Yeah, it probably helps if you're a fan of the Tv show. Some of the plot points, such as his obsession with his ex etc are pay offs from stuff from the series.
After 3 series you can't help but like them and then the movie feels like a natural extension. Go check out the tv series