The verb "hate" sometimes is cofusing. If we form a tag question, for instance, we consider it to be negative, because it's negative semantically and that fact influences grammar. We say

> 
> He hates mushrooms, does he?
> 
> 
> 

But what about agreement? If someone says

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> I hate mushrooms.
> 
> 
> 

Should I agree "So do I. Me too"? Do we take the negative meaning into consideration or only the form?