It is fairly common for someone to post a question with an easy-to-fix notational error, for example, writing an integral and forgetting to put $dx$ at the end. Some users will just edit the post and fix the notation, but others seem to prefer commenting something like, "I don't understand what you've written. Is there meant to be a $dx$ at then end of that integral?"
This strikes me as disingenuous and rude. The user commenting this way almost certainly does know what the OP means, and what they're really trying to say is, "hey, you forgot part of the notation." I understand that this particular form of disingenuousness is common enough in the mathematical community - certain teachers like to use it - but is it fair to say that it does not create the type of atmosphere we wish to maintain at a site such as this?
Thanks in advance for your thoughts on this matter.
EDIT: It's apparent this question has produced a good deal of misunderstanding. I'm not asking how to respond to a commenter who I think is "playing dumb". I'm not asking if, or suggesting that, I can distinguish it from honest questioning. I'm asking whether doing it is a good idea. Is it helpful, or does it do more harm than good? I know that it happens sometimes, and I wonder if it is sound pedagogy.