柚子很幼稚c

Pomelo (or grapefruit in some contexts) being described as naive. It's likely chosen to portray cuteness or self-mockery, while also reflecting a fondness towards this particular fruit. The added 'C' might indicate that the person has some attachment to things related to Pomelo or signifies the internet slang term 'chī c' which expresses the feeling of getting embarrassed or feeling shameless behavior by oneself.