A dog whistle is a distinct, high-pitched whistle that is audible to dogs but not to humans.
This message is directed at a subgroup of people to garner support from that specific group.
In the context of abusive relationships, dog whistling can be used to target and terrorize the victim.

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This gives them pleasure in being able to get away with abusing you without consequences.
The son is then compelled to fix his unkempt hair anxiously in an effort to avoid punishment.
They will use anything you have disclosed to them against you.

Asresearchindicates, those with psychopathic tendencies take a special sadism in online trolling behaviors.
to gaslight you and invalidate your emotions while garnering support from others that you are overreacting.
You never deserve to be abused whether overtly or covertly.