I must confess that there are many times that I am selective in dharma work, and that is NOT practising dharma at core.
Most people will prefer to do a job that they are good at or have knowledge with, I guess that is pretty obvious as we can yield results faster. However, when we are working in a spiritual community, sometimes it is not about whether you are good at a skill and then you would obviously be given a job that suits you. There are times that it is quite the opposite.....
There will bound to be works that we would not want to do or do not have the know how, our normal reaction is to wait for others to come up to do it. In this scenerio, a true dharma practitioner would forego selectiveness and just say..... I will learn up and I will do it. And sometimes, one's Guru will also assign you with a task or a job that you do not like at all, but this is just to help us to over come our weaknesses so we can move up the spiritual ladder.
If Buddha is selective, then we will probably be burning in the hell without any hope of salvation!