You should look at the structure of the sentene rather than the meaning. If the construction is not a negative sentence you answer "too", if it is negative, you asnwer "either". I hate dancing.
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Hoa ThaiHi,Ok, thanks. I think I get it now.
You can say:
1. So do I.
2. I do too.
3. Me, too. (informal - verbally)
Note that hate does have a negative connotation. However, the sentence structure does not include not (i.e., negative structure); thus, we can only use so or too.