Not necessarily. I would suggest it however, that is, if you would like your clients to actually respect and like you.
Most lawyers i've met aren't the nicest and don't have very good social skills, but I suppose that's a stereotypical type of thing to say. I imagine there are many who know how to deal with people on a level that's normal, considering i'd like to become that kind of attorney.
I'd say, yes.
Best of luck.