Are you the student or the instructor? I ask that because that really makes a difference and if you are the instructor and have to ask that question then you probably should not be teaching martial arts. At the very least you would have to rethink your teaching approach here and what you are doing with this student now and what did you do with them before. Does he know how to fall and are his skills good enough yet for this? If not then he needs more practice and instruction and so far you have failed him as an instructor. I never really had much of a problem like this but at the first signs of it that meant either I failed in some way or that student missed something and needed some additional help and instruction from me as well as more practice at something probably. That might be working with them before or after class for 15 minutes, it might be scheduling an extra class addressing that aspect, especially if there were others also exhibiting the same problem, or focusing more time and attention on an aspect of his or their training to bring things up to standards. Doing nothing will just leave them floundering and eventually becoming frustrated and quitting or maybe hurting someone else even with certain techniques.
If on the other hand you are the student you can make an attempt to help them as well as mention it to your instructor. Are your own skills so good in this area that you don't need the extra practice on it and time devoted to it? Some of what I know and learned partly was handed down to me by others better than myself. They didn't have to but it sure helped me when they did and also raised my own level of skill, knowledge, and ability. Also sharing that with others and helping them later then raised my own understanding, skill, and knowledge of it even more in lot of cases.
As I see it you can let the student flounder and be done with them or maybe enhance your own skills and abilities here while also trying to help them. If you were that student what would you want others to do and just how good do you want to be at martial arts. A big part of martial arts is about learning and developing your skills and broadening your ability to apply and use them. You have a golden opportunity here to do that for yourself while helping this student.
A person should never be banned from a dojo because they are slow at learning the techniques. Everyone learns in different ways and at different paces. As a senior student, you should be patient with and help the beginners. You were once a beginner, too.
There are two kinds of stupid people. People who are really trying and can't get it and then there is the other kind. You know which I mean. Stupid people who think they are getting it and have a sense of pride about themselves. People who don't want to humble themselves.
I think as long as someone is giving it his best and isn't being a dick he should be forgiven for any short comings.
what would u do if someone came to your dojo and he was really really thick and couldnt understand the moves, like he kept freezing and tensing up when being thrown and kept doing all the moves wrong even being explained like a ga-zillion times?
what would u do would u ban them from your dojo?