What makes it okay for people to completely ignore you when you're saying something to them?

My boyfriend and best friend do that to me all the time. They don't even nod their head or anything!

At first I thought I must be boring the shit out of them with my nonsense. But then I realised that what they're saying is just as boring and unimportant as what I have to say!

Then why do I bother to listen and give a reaction when they don't do the same??!!