I'm aware of the myers briggs thing but what is 'type a', 'type b' etc personality?

I've never looked into how my personality would get categorised so I couldn't tell someone what my 'personality type' is.

I just watched a video on youtube of a woman barting about how she was rejected by a professional matchmaker. This would says she is a 'type a' and she will only date men who are 'type a' who make more money that her, who want to get married, etc.

She says she would never date a 'beta male' and regards them as doormats to be chewed up and spat out. 8-)

If a person is so hung up on categorising themselves they are probably going to have a hard time finding someone. What do you think?