This made me laugh:

People tell me it’s not canon, so it sucks.

(It’s not supposed to be canon. That’s why it’s fanfiction.)

People tell me they don’t think I wrote Severus Snape accurately.

(Of course I didn’t; it’s my interpretation of a time-traveling grouch re-living his life so he doesn’t screw it up again. Pretty sure that’s not an accurate portrayal. But whatever.)

Time-traveling grouchy Severus Snape…

Now you got me curious. Interesting, isn’t it? How the very thing that can drive some people away can also get others intrigued…