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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 
Incredible posting powers are bestowed upon those who swear by the volcel pledge.
While incels are watching Andrew Tate and complaining about how women don't like nice guys, we study the blade
While noncels are consenting to intercourse, we politely decline to dedicate the time and effort to shitpost on a fringe online forum.
So much time wasted trying & failing to get laid, or succeeding in getting laid. Meanwhile we're having 200+ comment threads on who would win in Super Smash Bros. Melee if Enver Hoxha played against Amadeo Bordiga.
Bordiga easily.
Hoxha would bunker down and play defensively
Bordiga would also sit down and do nothing
The correct answer is a time out.
Not against a revisionist, enver would go ham
Gonna lame it out like cross tekken