Earlier quoted context omitted.
> "You must be disgruntled" But you are disgruntled. You've got excellent reasons for being so. I always wonder why people will use things like that as stoppers for the discussion, the fact that someone is disgruntled alone should not be cause for dismissal, the underlying reasons are what matter. And you've gone over and beyond the call of duty in my opinion here and I am frankly surprised that Amazon manages to ope…
"Disgruntled" is a straight up ad hominem attack that doesn't address whether or not what the person says is true or not.
All of the above, and I really don't see the ad hominem in there. It's just a description of a state of mind with respect to another entity.