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“What’s so great about Hexbear? Why do people keep talking about Hexbear? What’s so special about this instance?”
(hexbear.net)
Maybe it is more than an instance. Maybe it is an idea, a world-historical vanguard, light itself. 
actual attempt to answer (cringe)
We’ve been around for three years on a lemmy fork before federation. The lack of federation for years as well as the place we splintered off from (/r/chapotraphouse) already having a unique microculture within Reddit has given this instance, in my opinion, a distinct culture compared to general-purpose and even other hobbyist instances.
Regarding specifics, Hexbear is a vehemently queer-friendly/intersectional anti-sectarian socialist instance. Check us out 
now you get to join the rest of us in never being able to find emotes amongst the uncountably infinite images.
Wouldn't it be funny if someone had absolutely no idea how to access all those emotes? Lol. What would you even tell them so they could figure it out? That would be hilarious!
Cough
That would be almost as embaressing as somebody who hasn't figured out how to get back to a specific reply to a comment in the thread from your inbox.
Witness
UNLIMITED POWER