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Calli is a better way of referring to Calliope than Mori is because Calliope is her actual first name whereas Mori is the family name, also literally every Holo calls her Calli and it's easier to say and sounds nicer. Literally the only reason that anons insist on using Mori is because Calli reminds them of California and this triggers them whereas Mori sounds more japanese. Also Mori sounds more formal, professional/cold and therefore less friendly and more detached and since a lot of anons hate her, referring to her in this way is psychologically easier for them than since it distances themselves from her and makes her intuitively sound more unlikable rather than calling her a name that sounds like a friendly nickname