When a speaker says, "Jackson says he believes that
there is intelligent life on some other planet in the universe, but how can you
believe him? He's not an astronomer; in fact he is not a scientist at all. The
only degree he has is a Masters in Business Administration.", then he is
guilty of using which Ad hominem.
To add, Ad hominem short for argumentum ad hominem, is in which an argument is rebutted by attacking the
character, motive, or other attribute of the person making the argument.
