Do people with severe self-esteem issues go overboard/overcompensate?

Do you know anyone like that?

They say things like they "own" a yahoo account as opposed to having a yahoo account. They "own" a company as opposed to participating in an employee stock ownership program.
Their employer is their "client".

Another symptom I tend to see is that they consider themselves above all others on one, more, many or even all subjects - to the point that no one else has any value to add to the conversation.

It is rather frustrating to try to converse with these kinds of people.

Am I alone, or does anyone else know of someone they interface with (IRL or Online) like that and how do you handle it?