This whole thing makes me shudder to my core, OP.
My reflection would go something like this:
'I have been considering what you shared with me on X date. You explained that you were concerned about [give your summary here with direct quotes where possible].
My first reaction is that I do not want to make anyone else at work feel unhappy or uncomfortable. This is never my intention.
I am having difficulty accepting the concept of a 'normal range of emotions'. It occurs to me that a situation does not inherently trigger the same emotions in everyone. For example, the same work situation might trigger sadness, anxiety, frustration or in fact trigger no strong emotion at all. Different people are affected differently by different things. People responding differently to one another does not make anyone better or worse; there is no 'right' or 'superior' reaction, at least not the majority of the time as far as I am concerned.
I am also aware that people not only have different underlying experiences of emotion; they differ in their style of emotional expression. This is a very personal thing and is again not a question of right and wrong in my view. For example, on the occasion you mentioned, I instinctively used what I intended to be humour when faced with a stressful situation. This didn't reflect on any lack of care over the work or on the impact of workflow on me and my colleagues, but is a habitual style. Other styles of expressing and coping with emotions are equally valid and I do not view anyone in a negative light for responding differently. Once again, we are all different.
If my way of expressing my emotions has caused you concern, this is useful for me to know and reflect on. It is good for colleagues to understand one another well and to consider how we come across to one another. At the same time, I do believe it is important that different emotional experiences and styles of emotional expression are respected wherever possible. Diversity is a great strength in a team.
We all have times when we feel vulnersble because we are human beings. It is clear to me that it matters to you that I feel comfortable to express vulnerability. I have noted this and can see why it is important as part of a supportive workplace culture - something I value. I certainly want to continue to support my colleagues whenever needed. Yet true vulnerability must be genuinely felt and expressed in a way that the individual is comfortable with. This is important too.'