I never actually asked them, but the ones I did know didn't think too highly of JWs. Hate might be too strong a word, though.
I believe this is a good summary of the behavior of most Catholics.
My experiences as a devout Catholic (a long time ago):
First, most of us have no clue what the Watchtower really is about. I'm sure that will hardly surprise anyone. We don't usually want to change religion, happy as we are where we are, so the Jehovah's witnesses are those guys who don't take transfusions (odd, isn't it) and place Watchtowers and Awake!'s. You'd rather pretend you're not home if you don't want them to sell you a Watchtower which you won't read.
And yes, they are crazy not to take transfusions, aren't they?
Some other Catholics do not think "too highly" of JW's, for the simple reason that these Catholics don't know much about WT doctrines but they do know that the WT holds a terrible grudge against Catholics "per saecula saeculorum". If you ever lay your hands on a Watchtower, eventually you will hear that the Catholic Church is wrong in this, and that, and that... et cetera. The attacks never end. Don't the JW's call it "The Harlot"? I'm sure many people will understand that your dearly beloved church being called a harlot is not exactly a comment that is taken lightly. What would witnesses feel if someone came into a Kingdom Hall to say "you pedophile bastards who mistranslated the Bible"? I'm sure many a witness would say they are being persecuted. Many would claim they are not pedophiles, rightly so. Many others would say you have no right to do that. I'm sure I have made my point.
I remember that I once gave a ride to an elder and his girlfriend. They were trying to get me to "study" and this elder (who was much younger than I am) would be teaching me. My mother had given me a small stick-on rosary to protect me from evil. Now, I don't think that would protect me, and I certainly don't believe in the church, but I hung it from my windshield so my mom would be happy. By the way, I did the same thing when my sister gave me a cute little plastic witch in her broom. I still remember how those two witnesses looked at the rosary and made a face of disgust. I am sure they would have asked me to remove it if they hadn't feared that would make me run away.
Some Catholics are indeed rude and perhaps even aggressive, but those are the minority.
The more evolved Catholics say you have to respect other religions and let people preach whatever it is they believe. Sounds like the Watchtower, right?