NOTP: the opposite of an OTP (One True Pairing). It is a ship a fan strongly dislikes. The word is a portmanteau of ‘no’ and ‘OTP’ and thus is not a contraction of any particular phrase.

Squick: anything that is a deep-seated, visceral turn-off. Squicks may be shared by many fans or be specific to one; one person’s kink may be another person’s squick.

YKINMKATO, or kink-tomato: Your Kink Is Not My Kink, And That’s Okay: used to indicate support for fannish diversity and to distinguish between disapproval or kink shaming and simply having different taste.

DLDR: Don’t Like, Don’t Read: a phrase used to warn against complaints about an aspect of fic or meta. A “live and let live” philosophy of fandom, which places the responsability for avoiding content one doesn’t want to see on the side of the fanwork consumer, rather that on the creator’s.

SALS: Ship And Let Ship: similar to the above specifically about shipping tastes.

YMMV: Your Mileage May Vary: a phrase used to acknowledge that any given individual’s personal opinion on the topic at hand may differ due to their own tastes, standards, values, experiences, etc.

As the OP points out, all of these crucially imply no moral judgment of what they’re designing.