(For Tieflings)
Notice how you already had to add an exception ("or transformed..."), and it's now descent, not just direct creator attention.
All minotaurs were either directly created by Baphomet (IIRC?), or can trace direct ancestry to such. All of them. ...
To me it's almost guaranteed to be a much, much, much more distant one. Because, as stated, 100% of minotaurs come from beings directly, personally created and taught by Baphomet(?). The vast majority of tieflings don't have that connection. It could, quite literally, be that their great-grandfather did a bad thing exactly once, and the curse has only finally flowered three generations later, in a child who literally never did anything wrong and who came from parents who literally could not possibly have known any of this.
This is a difference without distinction. A minotaur's connection to Baphomet, could, quite literally, be that their great-grandfather was created by Baphomet exactly once, and the minotaur child literally never did anything wrong.
Again, all Tieflings are
descended (to use your term) from something that WAS Evil Incarnate (Evil Outsider ancestor) or altered by Evil Incarnate (human touched by Asmodeus, willingly or not, and the implication of the lore is usually that this ancestor actively embraced evil).
All minotaurs were either directly created by or
descended from creatures directly created by an evil deity (note the small "e" here - while evil deities are evil, they are usually seen as complex beings, not unadultered evil like a planar denizen of an evil plane).
So a minotaur owes its minotaur-ness to evil (Baphomet). The tiefling literally owes their very "tiefling-ness" to Evil Incarnate.
One is descended from evil. One is descended from Evil. What's the difference?
It's that you personally find "size" and "bull horns" and "obvious bull head" to be more off-putting than "skin hue" and "vestigial horns." You may be right that other humans would have the same predisposition. But to the point that was already made - that more often it's RELIGION than RACE, I would submit, that the difference between owing your differences to evil and owing your differences to Evil is more akin to that.
Also, I suppose in the interest of full disclosure, I should note that I personally find the "misunderstood, good-hearted PC tiefling" trope (where "tiefling heritage" is used as a stand-in for whatever group the PLAYER identifies with but thinks everyone else "others" - which can be something as mundane as "nerd" in the 80's and 90's when being a nerd wasn't cool) to be even more widespread and therefore boring than humanocentrism, which is probably why I missed the change to tieflings... because I actively avoid them (does that make ME prejudiced against them? Perhaps, but it's mostly because I prefer to ask people not to actively try to drag their out-of-game baggage into my escapist hobby).
(Think "every PC drow is a Drizz't wannabe" fatigue... when every drow/tiefling wants to be the "exception" and it's gone on for decades so the "exception" has become the rule, it makes the very idea boring. I would actually find the idea of a player that wants to play a Cambion that has fully and unabashedly embraced their evil heritage and revels in their badness compelling at this point.)