I met a cleric ...
I knew she was trying very hard.
But the only person she healed was the person that was assigned the tanker. At first, we all told her that the fighter was the tank. When the fighter came back with a mob, I would draw nearly half of that mob, but she never healed me because I wasn't the tank. We've all tried telling her to heal all of us, but she never did. Another person in the party decided to try tanking, but she never healed her either because we never told her that the tank switched.
The cleric told us that she was pretty sure we didn't know how parties worked. A person in the party got mad, quit the party, and in a few hits killed the cleric. We disbanded the party.
At times, there is a reason that people complain about clerics. Even when a cleric thinks that they're doing a good job, maybe it's not enough for others. I've heard clerics say again and again it's not possible to keep xx people alive or it's not possible to draw so many monsters and be kept alive, but it's possible and I have experienced it. Maybe they haven't, but I have, and that's why I don't think it's enough.
That's what separates good clerics from bad clerics. Even if the cleric thinks that they're doing a good job, if in the eyes of others they aren't, then they haven't experienced enough to know what they're doing wrong. If a cleric keeps doing something that dissatisfies whoever they're partying with, then it's no wonder that verbal abuse comes into play. If someone kept failing again and again and again, to the cost of not only one person but an entire party or KQ, how would you react?
Also, bad memories with other clerics come into play ... if people repeatedly party with clerics that don't heal, rez, pay attention etc., then of course they wouldn't like clerics. It just means that clerics need to make a better impression on people.
A cleric is like glue to a party; why else would we expect so much of a cleric?
So no ... not everyone hates clerics. But if there is a person that does, you have to stop and wonder at the reason.