I am as confused as you. In all my years of watching him, I haven't seen him do anything to deserve the level of hate he gets; non-wrestlers on the forum say he's a dangerous wrestler; wrestlers get hurt, as what happened with D-Lo, Zema, when Stone Cold got hurt, and Taz got hurt, etc. The situations were different and fault can be placed differently depending on the situation, but still. When some wrestlers commit crimes like domestic abuse, drunk driving (it's okay if you don't kill someone, amirite?), drugs, etc. but are still loved, it confuses me more. I don't care what someone gives to me with regards to entertainment, but if in real life they're a douchebag or if they do something horrible, I can no longer co-sign their greatness; I cannot look at them with the same admiration anymore. So maybe something happened in his personal life that I'm not aware of. If not, apathy or dislike, I get, yes, but hate to the degree that I've seen, boggles me. I've seen wrestlers that are not wrestlers being put over as wrestlers and wasting precious television time while real some wrestlers are barely featured or are not featured at all and/or are crapped on, and I still don't have the level of hate for them that I've seen for Hernandez. It makes me angry at the company instead, because who is featured and how is the decision of the company. I've seen more of Velvet Sky (who yes, I like a great deal), who is barely a wrestler, and Brooke Hogan (who I do not dislike) who is not a wrestler, than I have of Hernandez, who is a wrestler and whose botch level is lower than some, more popular wrestlers. He's a boring, stereotypical character who is not Austin Aries on the mic or on the mat. And? There are far worse. He comes out, wrestles some, doesn't talk for the most part, then leaves, forgotten. So yeah, it depends on each person's perception. Thank goodness the guy isn't holding the WHC or TNA's IWC fandom would dramatically decrease.
Like I keep saying, when the company doesn't handle a wrestler in a way that makes fans care (and also if the wrestler himself does not work hard to get over, or seriously lacks charisma to do so), then it's easy to wish they were gone and/or step on up on the hatewagon. No wrestler is immune.
James Storm is a prime example. I think Hernandez has fans, just not here, or amongst many of the IWC.