I suppose I could say I'm a professional writer who's still waiting for that first check to arrive.
Were you acting as a professional writer when you pointed out (correctly) that I substituted mute for moot? I don't think you were, or needed to be. You simply spotted a mistake of mine that I had missed.
I see enough mistakes in your writing, which presumably you either didn't see, or didn't care enough to correct, that I'm confident challenging you on the wisdom (or lack thereof) of being a nit picker about other people's grammatical errors. You can do what you want, of course; I'm simply letting you know that I think it's a mistake on your part to do so.
I make mistakes all of the time, so I'm not pretending to be faultless or anything even close. But then, I don't challenge people on minute issues of grammar either -- so long as their meaning is clear. That is, unless they irritate me.