There is a difference between the defined meaning of "ego" in "'ego' state" or 'ego'tistical' or 'ego' as Freud conceptualized it.

The "ego state" of ESD refers to alters, the ego of "egotistical" refers to a person/self who is self occupied, the ego of Freud refers to the socialized "self" which exists between the id and the superego.

An "ego state", certainly, is not usually conceived of as a "negative" thing. It's simply a part of self -- a part with it's own habits, purpose and meaning -- might be good, bad, or neither.

M