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From the first bullet of The Shut-In: The self-imposed shut-ins who for whatever reason cannot bring themselves to go outside, or simply do not want to do so.
But the rest describes someone who prefers to be alone, not just indoors or avoiding nature. Your description sounds like it would also apply to someone who is fine with social gatherings, traveling, and novel situations, as long as it doesn't involve being around plants and sunshine. I don't know of such a trope.

The Opposite of a Nature Lover? But, not to the extremes of an Ecocidal Antagonist. Like, somebody who spends all their time indoors and/or holds the opinion that every Camping Episode is a Horrible Camping Trip?
Would that just be a Downplayed Ecocidal Antagonist?