It's very simple. When I argue with idiots what tends to happen is I start off making a simple statement of a simple position. Then that statement is confused by said idiots so that I have to explain what I said again in more specific detail - this often requires two things 1. length and 2. abstraction (and the inclusion of 'long' words - actually they aren't necessarily long at all, they are esoteric) . It required 2. because basically what's happening when idiots get confused is I have to teach them how to think about something. This obviously causes a little loss of face and pride for those idiots who probably aren't aware that they are idiots - hence the 'he's using long words' riff that you are displaying.
I've certainly been known to use plenty of bigger words myself, you really just give the impression that you're trying too hard, like when I was writing an English paper back in school and forced in vocabulary words just to please my teacher even though I didn't think they really fit as well as a simpler word. Anyway I was just trying to find anything I could to make fun of you for, maybe I hit the mark with that one and maybe I didn't, you're still a troll and an asshole who has a massively inflated ego so don't let you being well spoken (or at least good at faking it) go to your head.