There is a 8th grade boy with lots of pimples so i nicknamed him as mr. pimply

I am 5'7(171.5 cm) and in 11th grade 16 yr old and he is 13 now. He is like my height sometimes look even taller than me. I call him pimply for fun and he calls i am too immature for my age. I ask him who is taller among us he always say in sarcasm that i am a giant