Then let them know personally, in a dignified manner, through a PM. Instead of PUBLICLY announcing that they're "bad RPers". That's horrible for their reputation, as well as their self esteem.
Think about how it would feel if someone you're Roleplaying with posted "Oh my gosh, Alowlyloverssong is NOT a good RPer, man...". And it's public, so now everyone knows, whoops.
Dude, it doesn't matter if you wrote down their names. I'd feel pretty awful if I went to one of my RPer's profiles only to hear that they think I'm a bad writer. It doesn't matter what I think of myself. That is an AWFUL shot for my self-esteem. And having that be public just makes that worse.
Oh.
And I appreciate you telling me I have the inability to read. Nice.
But let's believe for a second that they're OKAY with this.
To the naked, public eye, it just looks like you're being a jerk, and calling out all of your RP partners for not being as literate or skilled as you are. Publicly. That's a bad image to be setting out there for yourself, bud. And the fact that there is no context just makes you look like even more of a bad person, which you might not even be.
In conclusion, if you've already stated to them by another means - that is respectful - that they are "not good at Roleplaying", and have given them proper criticism, I can't see how this status update could help them (Or your reputation, for that matter) in any way, shape or form.