The expectations and reactions of individuals can vary greatly based on cultural norms, personal preferences, and social dynamics. While it is not possible to pinpoint the specific reasons for each person's behavior in your case, there are some common psychological and social factors that may shed light on this phenomenon:
Social norms: In many cultures, it is considered polite and friendly to initiate conversations or greetings with a "hello" or a similar greeting. When you deviate from these norms, some people might interpret it as being impolite or unfriendly, leading to a negative reaction.
Communication styles: Different people have different communication styles and preferences. Some individuals are more assertive and proactive in initiating interactions, while others might prefer a more passive approach. People who are used to more assertive communication might expect others to initiate greetings and get offended when it doesn't happen.
Reciprocity: Humans often expect reciprocal behavior in social interactions. If someone says "hello" to you, they may anticipate a similar response from you. When they don't receive it, they may perceive it as a lack of interest or courtesy.
Personal insecurities: In some cases, individuals might be more sensitive to perceived slights or lack of acknowledgment. If they already feel unsure about their social standing or self-worth, not receiving a greeting from someone could reinforce those insecurities and lead to offense.
Context and relationships: The dynamic between you and the other person might also influence their reaction. For example, if you have a close or familiar relationship with someone, not saying "hello" might not be a big deal. However, if the person is an acquaintance or someone you've just met, they might interpret it differently.
It's essential to recognize that people's expectations and reactions can be influenced by a multitude of factors, and they may not always be rational or directly related to your actions. To navigate social situations effectively, it's good to be aware of cultural norms and individual preferences, but also remember that it's impossible to please everyone all the time. The key is to be authentic and respectful in your interactions while acknowledging that people's reactions are ultimately their own responsibility.