Wow I feel like a terrible human. I say I don't care and whatever often. I never mean them with any kind of anger or annoyance. It's just me being very indecisive for one and also, growing up, my parents and siblings etc always said these things to each other, to me, its normal.

My former best friend and I used to do that all the time "What movie do you wanna see?" "I don't know, whatever" Then we would kinda do that back and forth a bit and eventually are on it. I've never thought that much into those two phrases to see them as so negative.