The conflict I will describe happened on QQ, which is the Chinese version of MSN. The people involved are one of my friends and me. She is my secondary school mate and studying at NUS now. She is older than me, but like many other Chinese students here, she had to study 20-month transitional courses before she could start her university study, so she is actually in Year 2 now, one year later than me. As it is the first time that I have been in Singapore and I am actually a freshman to NUS, I really need someone to answer my questions and help me to settle down here. Therefore, I referred to her for help.
One day, when I asked her some questions on QQ, she was very helpful as usual. After she answered me, she said she felt she was like my senior. As a joke, I said “Thank you, senior sister.” She also perceived it as a joke and said “haha” to me. I called her senior sister three or four times that day and nothing got wrong. However, on the next day, when I said “Thank you, senior sister” as a joke again after I asked her questions, she got angry. “Do you know how annoying you are” said she “I already feel I am old and I have wasted one year. Still, you are calling me senior sister all the time!” Seeing that, I got really ashamed and did not know what to say but to apologize.
Could you help me to analyze this conflict to avoid similar incidents? I will value every feedback to me.