^I happened to know your intent but chose to be pedantic on behalf of those who aren't.
Huh? You've obviously confused being duplicitous and quoting out of context with being pedantic. In point of fact, purposefully misrepresenting someone's statements is not being pedantic, but deceitful.
What is the desideratum of using a sesquipedalian vocabulary on a forum such as this anyhow?
Not this bullshit again. It's exceedingly childish and anti-intellectual to mock someone solely because their vocabulary is larger than the average or one's own. The English language places at least 500,000 words at my disposal. Yet your expectation is for me to limit myself to humor the most unlettered and unread amongst me? Why? Also, my advice to anyone wanting to satire someone's "sesquipedalian" vocabulary in the future would be to make sure the "big" words they use in their derision are used properly or used not at all. Otherwise, confusion may arise around the intended object of one's ridicule.
But, lexical clumsiness aside, I think your question is about why I find the need to use words that you think are pedantic. Well, apart from being a veritable logophile, some of my reasons may be best expressed in the words of others:
Loving your language means a command of its vocabulary beyond the level of the everyday.
-John McWhorther
One forgets words as one forgets names. One's vocabulary needs constant fertilizing or it will die.
-Evelyn Waugh
Every time I have to look up a word in the dictionary, I'm delighted.
-Vivienne Westwood
Words - so innocent and powerless as they are, as standing in a dictionary, how potent for good and evil they become in the hands of one who knows how to combine them.
-Nathaniel Hawthorne