i don't like calls

my best friend LOVES calls, he calls me i think everyday, even if we met yesterday or something. me personally, i HATE when i'm doing something and someone calls me without asking first, so i usually let it ring, because fuck you. there's times i tell him i'm not in the mood but if he calls every day and i'm never in the mood he's gonna think i hate him, so that's why i usually let it ring, or pick up even though i don't want to. 

it's really weird, because there's times i'm actually in the mood to talk, but that's after like 3 days without talking. 

but when i'm doing something/nothing passionately i just feel like if i would pick up i would come out of my comfort zone or something, even though i'm 100% comfortable with that person. like it would take effort or energy to talk.

also, when i let it ring, he calls my sister and she comes into my room to tell me he wants to talk to me or something, and personally i think that's so annoying and disrespectful, because if i didn't pick up probably busy or don't wanna talk. now she's gonna camp in my room with him on the phone when i wanted alone time. 

i don't know if i'm the wrong one here, i think some people just prefer being alone at specific times and i've explained them that, but i don't think they truly get it. it's not my fault, if i could change it i probably would.