I joined the Marine Corps in 1975, just a couple years after Jane's infamous visit to Vietnam. No I'm not preoccupied with hating Jane Fonda but yes, I have no respect for her nor do I pay to see any of her movies or activities, I wont do anything that could be considered beneficial to her. I'm doing exactly what she did, protesting activities that I think are wrong.
Why do I dislike her? Well for me it's hard to like somebody that openly supported killing service members like me. Maybe you guys are too young to remember but Jane was part of a group of slime-balls that threw garbage on service members, spit on us, harassed us on the streets, even kicked us out of our churches as part of their hateful bullying attack plan. What's more, Jane supported the Vietnamese for her preference of a Socialist/Communist state as much as for any humanitarian concerns. The wealthy, pretty people of that time were very open about their support for communism and they had no problem with using violence to help push this country in that direction (which they're still doing but in a more political way rather then through direct confrontation). She sat on an anti-aircraft gun, looked through the sights as if she were imagining shooting at an American plane, smiled and goofed around acting like she was just one of the boys. She openly admits that she was part of a North Vietnamese propaganda effort that she agreed with, she helped put POWs on display in a dog and pony show. All those things supported and aided the Vietnamese war effort and directly or indirectly aided in the killing of American service members.
Yes service members understand that they might die while doing their job but it's really annoying when the very people that you are fighting for stab you in the back by making your job more dangerous. She had every right to disagree with the war effort and could demonstrate and make public speeches at home all she wanted but to actually go to Vietnam and aid the enemy, even through propaganda, is reprehensible and unacceptable.
The only thing that Jane Fonda regrets is that Veterans just wont let her actions go unpunished and it has a bad effect on every project she gets involved in. Every time she has a new movie, documentary, or public venue, she has to go on record apologizing for her actions in Vietnam just to try to appease the public so that she can make more money. She doesn't regret what she did, she only regrets that it makes it harder for her to stay rich.