I do not think the word "ad hominem" means what you think it means. An "ad hominem" argument is one that targets a specific person advancing the opposing argument. Ad hominem arguments are fallacious when the characteristics of those people aren't germane to the argument.
Obviously, no part of my argument focuses on whoever it was who said Apple's Dropbox rejection is an antitrust violation.
Obviously, no part of my argument focuses on whoever it was who said Apple's Dropbox rejection is an antitrust violation.