Don't know exactly why, but when someone introduces himself or herself to me as "aspiring social entrepreneur" my first opinion - this person is just useless in terms of doing any real business together.
Of course this perception may not be correct in some cases.
I think that's because of several factors:
1. When someone says "I work in engineering (construction, law, education, government, marketing, IT, farming, manufacturing, dosomethingreal)" you can say that at least you see what skills and subject area knowledge you could leverage as a team to build something or to work on some initiative or project.
It also shows credibility of the person, because it at least gives us an idea of what we could do exactly together as a team. Of course other wonderful skills and capabilities may be uncovered during the collaboration, but if initially there is a team of only people who call themselves "entrepreneurs" - nothing is going to work and we will never get any positive result. That's because of the next factor.
2. In general "entrepreneurs" don't do anything useful themselves, but just talk, produce some notes, spend time in meetings, conversations etc. I agree this may be a good business, but as a resource to build something 95% of those "entrepreneurs" are just useless.
3. Devaluation of the term "entrepreneur". From experience, majority of so-called "entrepreneurs" are just adventurers who pretend to be smart and take advantage of someone else expenses. They roam around searching for people who would like to buy their ideas without producing or delivering any value.
I trust specialists, not entrepreneurs.