I'm a bit wary about using "over" before a word. You feel how you feel and that depends on what experiences have led up to this. Like the others say, it may be a trigger and if the original issue has not been dealt with, then your reaction may well be natural. Perhaps not healthy, but understandable.
I can understand your reaction, as it happens. I think my reaction would be similar, however I would recognise that in the scheme of things it's not that important. Tacky, tactless and unhelpful, yes. Worth dwelling on, probably not.