Minimum Site Standards for Storygames
"We're not expecting perfection."
Just make sure your stuff meets this and don't worry about people's comments. Usually comments that point out mistakes and what not (criticism) is supposed to help the writer improve. With that said there is always room to improve, or at least that is what I think, and as such if you don't want to try and improve because you feel you are good enough/happy with yourself, then you don't need to worry about it.
Don't misinterpret comments left by people trying to be helpful as insults. Most people won't go around trying to be mean for no good reason. There are some who's writing tends to come of that way, but they are probably going for the 'tough love' approach (although thinking about it there is a whole number of reasons it might appear this way).
Obviously if you can't be bothered and just hate the idea of people criticising your work, and you can't find the power to not care, it can suck. Don't let it demotivate you. Pretty sure that even if you ignore criticism and just write you will end up improving, although it might be at a slower pace.
Do note that this site has a... rather open approach to handling what people can and can't say. You can say almost anything, even more depending on context (from what I gather). As such it might feel a bit different to sites that control what is deemed appropriate more heavily.
You can always try looking for a site that doesn't allow criticism and what not if that is more your cup of tea (or one that lets you disable comments, or just doesn't have them).
Then again I might have completely misunderstood this post and all I wrote here is irrelevant. If so, whoops.
TL;DR
People are given the power to comment, usually readers who leave comments have good intentions, there is always room to improve, try not to worry about it if you don't want to, and there might be a better site for you out there.
EDIT P.S.
Pretty sure super long storygames by people who aren't 'famous' tend to get very few comments. If you want to avoid comments write something super long, then publish just before a bunch of contest enteries come out. This will push your storygame into the void where few people will read it, and fewer still will comment (oh and don't enter the contest).