[LordPomposity]

Ignore the grammar nazis.

"Nazi" is a proper noun.

[Scourge of Ages]

Ignore the grammar nazis.

"Nazi" is a proper noun.

Only when referring to the Nazi Party as appeared during WW2. When using the word to refer to other things, such as "grammar nazi" or "spelling nazi" or "history nazi", it is acceptable to use the lower-case version, due to the shifted meaning. It doesn't refer to National Socialism in these new contexts. It's a common mistake.
Yeah I just made that up, don't be a fact nazi

[deathfun]

Grammar Nazi is considered a title and is to be treated as such.
Not only that, but the Nazi failed to realize the clear comma splicing. The sentence should read:
"Ok, maybe I should not have mentioned Star Trek. These are Freespace forums, not Star Trek forums."
Alternatively:
"Ok, maybe I should not have mentioned Star Trek as these are Freespace forums, not Star Trek forums."

Personally, I would have typed it out as:
"Alright, perhaps I should not have mentioned Star Trek in a Freespace forum."

That is all. I shall resume my duties browsing Youtube scrutinizing small children

[Lester]

Ok, maybe I should not have mentioned Star Trek, because , this is these are Freespace forums, not Star Trek forums .

The third S in FreeSpace is also capitalised 

[Black Wolf]

Aaand this thread has served its pupose.