It could be a type of social anxiety, but maybe just general anxiety, if you felt threatened by this guy's behaviour. I've been there before. It's so uncomfortable. How awful for you, to have the anxiety.
But anixety or panic happens anytime we experience something fearful or what our minds perceive as fearful. When something like that happens it's probably a good idea to take a few minutes to breathe, and calm down. Even if you couldn't do that until you got home.
You are safe, and it sounds like you handled the situation well. I know the anxiety is awful. How is the Seroquel going?
Bipolar II, Anxiety/Panic Disorder
.5mg Clonazepam, 50mg Trazodone
--Currently not on meds for bp--