If I tell people to get out, it's usually because:
- Person is being an ass to others in the group / disrupting the group
- Person is being belligerent/hostile or overly aggressive
- Person is not listening to other people, yelling at people, just yelling in general, etc.
- Person is threatening other people or actually hurting them
- Person is threatening to break other people's property, behaving in a manner that is likely to cause damage to other people's property, or actually breaking other people's property
Those are the most common reasons I tell people to get out. Much of it is probably not related to my type, though.
But, as you said, it's moment-to-moment. A person who was thrown out one day might be back in the next. I'm not rejecting the person themself; it's not a judgment of the person. It's simply a statement that "You cannot be here unless you can behave yourself." They are welcome back if they behave themself.
I'm quite welcoming and will generally welcome people in, no problem, but then sometimes if I feel a sense of responsibility for the space, I'll take charge of the space and control the atmosphere. That can include removing people who are misbehaving (for that context; obviously, appropriate behavior is context dependent).