Asking someone "how are you doing?" is a common and polite social greeting, but whether you should expect them to tell you about their day in return depends on the context and the relationship you have with the person.
In most casual social interactions, when you ask someone "how are you doing?" it is generally seen as a polite and friendly gesture, and the expected response is often a brief, positive acknowledgment such as "I'm good, thanks," or "I'm doing well, how about you?"
It's important to remember that not everyone may feel comfortable or willing to share details about their day or personal life, even if you ask the question. Some people might prefer to keep their responses brief, especially in passing conversations or with acquaintances.
On the other hand, in closer relationships or conversations with friends, family members, or colleagues you have a good rapport with, asking "how are you doing?" might lead to more in-depth discussions about their day or what's going on in their lives. In these cases, it's more likely that they might share their experiences and feelings.
The key is to be attentive to the other person's cues and body language. If they seem open to sharing more or if you have a closer relationship with them, they might be more inclined to discuss their day. However, if they give a brief response and don't elaborate, it's best not to push them for more information.
In summary, asking someone "how are you doing?" is polite and friendly, but the level of detail they choose to share in return can vary based on the context and the nature of your relationship. Always be respectful of their comfort level and boundaries.