"Okay." "That's fine." "Doesn't matter to me." "I'll have what he/she's having" how do you deal with someone like this?

Soo just thought about that partner who seems perfect but missing the most important thing in a relationship: personality. (if that's what it's called) You want a salad, she'll take a salad. You think that show sucks, so does he. You wanna go off about how annoying they being a flimsy jellyfish, they agree 100%. Hell, even trying to have sex is uncomfortable. How do you deal with such a partner? Leave 'em or change them to be more defensive, confident... even engage in an argument?

"Okay." "That's fine." "Doesn't matter to me." "I'll have what he/she's having" how do you deal with someone like this?
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