Practice healthy habits online and offline. Ad hominem attacks are all about redirection.
They are used to redirect the listener away from the subject at hand and towards an individual.
Here's how to know if this is happening:
✓ The speaker is targeted, rather than the argument.
✓ The speaker’s alleged negative characteristics are used as justification that their argument is wrong.
✓ These negative characteristics are unrelated to or irrelevant to the argument being addressed.
Original source can be found here.