This is not a personal swipe, just a sarcastic remark on a tactless and judgemental comment.
I would say it's the other way around. You made a tactless and judgemental comment on a sarcastic remark.
I ride kick scooter almost daily on my commute and can't find anything sarcastic about calling it "completely dorky", sorry.
I've also gotten used to not hear (or make) such comments in my adult life, contrary to the school years, where it was a norm of communication, unfortunately.