If I did decide to give one a try, there are still some things that would make me decide not to. Like if the DM said humans only because all the other intelligent races are evil andare trying to destroy the humans. Or if the DM said human only and everyone has to be from the same place and be the same race/ethnicity. At that point, I would be wondering if my DM were hiding some secrets about how he really feels about some people in real life, and that would make me very uncomfortable to continue being his friend.