Calling someone irresponsible is not, in and of itself, an ad hominem argument.
Saying a position should be rejected because it is presented by someone who is irresponsible is ad hominem.
Ad hominem argument isn't the same thing as a personal attack; its the fallacy of arguing that a position should be rejected because of the personal characteristics of the person presenting it.
Saying a position should be rejected because it is presented by someone who is irresponsible is ad hominem.
Ad hominem argument isn't the same thing as a personal attack; its the fallacy of arguing that a position should be rejected because of the personal characteristics of the person presenting it.