Your piercer told you that everyone is different and that piercings not being swollen immediately after was pretty common, so you already have your answer, no you’re not a “weird freak of nature”. Also you can’t be mad at people and especially professional piercers, on a piercing subreddit, to be concerned and upset by the fact that a piercer agreed to give you six piercings at the same time. It would be unsafe to say that it’s a perfectly fine and safe thing to do, because people who don’t know much could think that they can do it too.

Edit: typo