Here is a list of ad hominem arguments you can use against me if you feel like it.
I was raised in a conservative Christian setting (my father is a professor of Old Testament), and would still call myself a conservative Christian. Therefore I am a blind product of my environment.
I am male, middle class, white, heterosexual, cisgender, non-disabled, and pretty much any other privileged group you can think of. Therefore I do not know about struggle or pain, therefore I cannot have empathy, therefore my thinking is cold and inhuman.
I am profoundly emotional, therefore I cannot think clearly.
I love old ideas, therefore I am blind to progress, therefore my ideas are no longer valid.
I hate conflict, therefore I desire to agree with those around me, therefore I agree with whoever talks to me most.
I am a software developer. I have not spent much time formally studying philosophy, theology, government, economics, sociology, gender/race studies, or anything like that. Therefore I do not know what I am talking about.
I hate being told that I should believe something. Therefore, I am unreasonable, and my beliefs are unreasonable.
I felt the need to write this snide list, so I am arrogant. Therefore I am closed-minded, and my thoughts will be ignorant.