I think it's fine. It isn't the correct way to say "ask", but I can understand it, so whatever. I do have a problem with trying to turn "axe" into the proper pronunciation for some people though.
I think the entire ebonics movement is borne of a tendency people have to do something a certain way and then retroactively declare that how they were doing it was the "right" way. I've seen a hundred examples of it in my life, in all categories of activity. The underlying thread in all of it is that people do things that they know aren't exactly right, but they also don't want to admit that they were doing something wrong, so they try to manipulate the variables to justify their actions after the fact. In this case we have a whole lot of people who are speaking improper english, and instead of trying to correct their speech they're trying to change the nature of what is proper. It all boils down to laziness really.