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I did mean grammatical difference. A tad confused why do we use genitive...I mean, такого is genitive after all. Why start this phrase with genitive?

Интересно какая разница между - "Такого быть не должно" и "Так быть не должно"?

How would you said "it shouldn't be like this" ?

For example...

I wonder why is the coast so dirty, it shouldn't be like this...