Communication Breakdown

I have put together all kinds of reasons in my head as to why some people in my life seem to think it's proper etiquette to not respond to simple questions.  I have platonic friends, and past and present lovers who do it.  My friends get off a little easier for this transgression, but the ones who have been in my bed and I in their's seem to be the repeat offenders.
That being said, what is UP with the lack of communication skills between human beings?  Now, if we have managed to bypass the bullshit and have had a successful friends with benefits type of relationship, whether in the past or ongoing, why is it acceptable to blow me off?  Your behavior leads me to make more than one assumption -

• You think "Hey, do you like The Smashing Pumpkins?" is the equivalent of me asking, "Will you marry me?"
• "Do you want to go to the gym with me?" is the equivalent of me saying, "Hey, come try to have sex with me even though you know I won't oblige."
• "Hey, can I get those panties I left at your house back, they're one of my favorite pairs" is the equivalent of me saying "I want to have your baby."

I've made these assumptions because I'm not a nag.  I don't text past and present lovers on a daily basis, for any reason.  I don't intend to take over your life and expect to check in on you 80 times a day.  Occasionally I go to concerts and I always like to invite anyone and everywhere to come with me.  Occasionally I get bored going to the gym alone.  And, Oh!  God forbid, I thought my inquisition might pertain to an extra-curricular activity you'd enjoy!  My bad.  I've asked you a simple question, probably not having had contact with you in over a week or so because there has been no need.  We've engaged in non-sexual activities, as friends, before, so when I ask you if you fucking like The Smashing Pumpkins, I deserve a fucking yes or no, not hearing it secondhand that you wouldn't go - even if you had the money - from my brother.  And since you're obviously over our friendship/fuckship/whatever-hell-it-was, but get along famously with my brother, maybe you can just give him those panties I left at your house.  But he would die.  And probably punch you.

Maybe it's just because you're a jerk and you belong in the jerk store - the one of which I seem to be the owner of.  That would be the simple explanation.

Please, please, please, I need some kind of justification for this behavior.  We are all on our phones 24/7 - I know you saw my text and I know you harbor some sort of affinity for me because you're blowing up my phone just hours after I texted you, yet it's not to answer whatever my question was.

Thanks for the aggravation, butthead.