1. They may have personal issues or past experiences that have made them cynical or distrustful of others. This can cause them to put up walls and treat people poorly, even when those people are genuinely trying to be kind.

2. They may have a different understanding of what constitutes kindness or may have different expectations of how others should behave. This can lead to misunderstandings and conflict, as what you consider kind behavior may not align with their expectations.

3. They could be dealing with their own insecurities or feelings of inadequacy. Sometimes, people belittle or mistreat others as a way to make themselves feel better or more powerful. In these cases, it has nothing to do with you and reflects more on their own issues.

4. They may simply have a different personality or communication style that clashes with your own. This can create tension or misunderstanding, even when both people are well-intentioned.

Regardless of the reason, the key is not to take it personally and to continue to treat others with kindness and respect. Remember, how someone treats you says more about them than it does about you.