This assertion that it's hypocritical for an immigrant wanting to Leave is based upon the idea of them closing the door behind themselves.
If you think it's hypocritical for them to want tighter immigration controls then I'd love to know the reasoning as that's something very different.
I find it a very negative accusation thrown their way
It's not about tighter controls... we'll have tighter controls if we remain anyway. It's about incredibly restrictive controls that may as well be closing the door.