That's a loaded term, used at the outset to poison the well, so to speak, so one has to question whether the question was asked in good faith and therefore would answering be worth the trouble.
No, it's not loaded (charged with an underlying meaning or implication), unless you're bringing along your own associations.
But it _is_ a careless misuse of a word that has a specific definition. Frankly, I can't remember the last time I saw it used properly.
It means "to manipulate someone by psychological means into questioning their own sanity". It's from a 1940s film where a husband convinces his wife she's going insane, by manipulating the lights in their house.
When a person does bad things and then is accurately described as having done those bad things it's not poisoning the well, it's putting up a sign saying "this well was poisoned".
Then quit with the disengenuous, cowardly half-speech and just say it, rather than couching it in the form of a pretend question. It's embarrassing and reflects more upon one's lack of character, frankly.
That's a loaded term, used at the outset to poison the well, so to speak, so one has to question whether the question was asked in good faith and therefore would answering be worth the trouble.