I am new to the site and have not encountered any illiterate members. Maybe it could be going way too fast to enter their posts and not giving it much thought as to what they are responding too.
I don't think there is anything wrong with what you posted.
I think that sometimes the keys stick and there are probably many not familiar with our English. So, no it is probably not you but a combination of things. I think I need a lesson myself.
I think it's you.Hahaha nah I'm just kidding.Maybe they're typing too fast that they missed out a point or two.Furthermore it's okay,you probably can ask that user to repeat himself once more.If the user still gives you the same sentence structure,then the user's dumb.