I take issue with it more and more these days. If someone is asking and it's not as a passing courtesy (like if I'm on a walk), there's a really cynical part of me that suspects they're asking because they really want to tell me how they feel. I've gotten very good at just numbing myself to the question and giving a cheery "Doing well, and you?" Deflect and offer them a platform to speak what they need to speak.
If I am honest and tell them how I really am, I'm usually met with the "I'm sorry, but you'll get through it, buck up" bullshit, or it gets flipped around and the person tells me about what they're dealing with.
I understand where the question is coming from, but I feel like people who are suffering just feel the sting of supposedly innocuous inquiries on a level many others simply don't or can't comprehend.