I'm a self identified nerd, I use it frequently as a term of endearment (like dude) and I see how that is confusing.

Okay, so when you responded, "Troll harder nerd" to someone that disagreed with you, that was you being endearing. That's the story now. Honestly, I believe that about as much as I believe that this gun store owner totally would never sell to a neo-Nazi. I say that endearingly.

Have I attacked anyone with my words? Were having a discussion comrade.

I already demonstrated this in the comment above. Either way - we're not really having a discussion. People are disagreeing with you, and you're acting butthurt about it. That's literally the extent of the conversation.

I truly believe the man is just an ignorant bigot, not an active fascist oppressor.

Okay, and to what extent does this distinction matter to you? Someone said he would sell to a Nazi. You then said, "Well, he said he wouldn't so we have to believe him!" Then, others disagreed because, frankly, it was a silly statement to make. No one said anything about being a "fascist oppressor," largely because that sort of cartoonish characterization isn't really important to the discussion.