Lazy eye is also called amblyopia. You can watch 3d movies with lazy eye but you may not get the 3d effect. It is not true for people who say they could enjoy the 3d in a 3d movie with amblyopia or one eye. 3d glasses can help you see clear images but not in 3D. When remoing your glasses, the movie is blurred, so you still need to wear the glasses. There are many types of amblyopia, in some cases; it's possible that you can get depth perception.
3d is about your eye itself, but lazy eye is about the way your eyes work together with your brain. So 3d movies will not hurt your eyes and don't be hesitating to see 3d movies.
Yes, 3d movies will be bad for your lazy eyes although you will wear the 3d movie glasses. Watching 3d movies will make your eyes get tied easily. That is why it is bad for your lazy eye. You may have to watch it for more than 1 hour continuously which will also make your eyes get tired. Thus, you should not do this and protect your lazy eyes.
Well, yes, in my opinion, you can see 3d movies even if you have suffered from lazy eyes. In common, if you go and see 3d movies with lazy eyes, you have to see it in pre-mixed glasses, and they are not the red and green one. But on the other hand, you should know that the only problem is motion sickness. So you need to be careful about it. By the way, lazy eye means that one eye has not developed normally and always has blurred vision. And in daily life, it is necessary to have one pair of glasses which doctor prescribe for you.