Some of you people are assuming that every xyz-fag term is meant as an insult, or a slur, when it's clearly not the case. In the case of normalfag, the insult is normal, not fag.
Fag in board culture is used as a simple suffix and descriptor, which is why fans of a series will call themselves "series"fags. It's honestly amazing how they were able to reclaim and recontextualize the use of an actual slur into something completely different.