why do most people i actully know irl hate me,but on the internet,everyone likes me~tails martinez

irl:my friend carlos and i hav known eachother since beginig of 5th grade,im in 7th know,but me and him almost never agree on stuff,for example.......lets say that (spanish.....google translate recommended) if i was like quien es mejor wiz khalifa o jason derulo....he says khalifa,and to this point,you just learned i like derulo.......so give your opinions on wat you would do,cuz i respect his thiking......but when he thinks i like everything he likes,some weird stuff could happen