I have seen this kind of thing going around plains for a while and
I think just some people just assume that everyone knows good grammar, punctuations,
and correct spelling.
And I would have to agree that some RPing groups are a little over the top of requirements
to actually join, and i find it kinda rude as well. But there are a lot of other packs / prides
out there that arn't so uptight about being literate.
I do find that the whole literate group is kinda shunning in a way cause it kinda tells
everybody else that you arent even worthy enough to RP with us. I say just find some
other pride and have a good time with them. ^^
Like the others said, it would be best for you to find a role play that best fit your needs. It also depends on what you like to role play.
Let us say that you like to role play a science experiment, and you find one that says they are literate, mapped and require a role play sample. That's your first clue that they are a serious role play and may turn down the smallest mistake. Usually mapped role plays are hard-core and very VERY picky about how people role play, and many find them intimidating and scary. I still do. I once joined a role play where if you didn't spend every minute in the role play, you'd be kicked out.
But, back to the point. You should try joining a few, less-serious role plays were you can learn all there is to role play.
However, I agree with Nemena. For a few of my role plays, I have required a role play sample. I just don't want "-kills instantly breaks neck and runs- " in my role play. Some people DO require role play samples, but aren't crazy and will let most people join.
I was very illiterate at one time and I was turned down from countless role plays. I even quit FH for a while, and one day, I realized that role playing is very simple. It will become very easy very soon, just don't give up!