You can critique the work, but there's a difference between giving criticism of a film or actor and being an absolute seething bullying / threatening them with "I want to kill you because you destroyed my childhood" etc.
Get into a discussion of what went wrong, tell them clearly once that this didn't work or that didn't work, or they screwed up over the other. Don't turn it into a repeated over and over, don't go out of your way to stalk them down and hammer them with threats and nasty messages.
That's the difference.
Edit: Also in consideration, when you're simply a working actor doing a supporting role, you don't necessarily expect the horde of fandom that is Star Wars to focus all seething hatred on you.