I've been accused of this.Insecurity is a feeling of general unease or nervousness that may be triggered by perceiving oneself to be unloved, inadequate or worthless (whether in a rational or an irrational manner).
A person who is insecure lacks confidence in their own value and capability, trust in themselves or others, or has fears that a present positive state is temporary and will let them down and cause them loss or distress by "going wrong" in future.
It was a curious statement which made me laugh actually.
Ironically, my irritation combined with pity was mistaken for insecurity.
How can I be insecure when I won?