What about you submitting a PR? Seriously these "well have you fixed it yourself??" comments are annoying.
The OP is asking for somrone to do work for them for free... I think asking the OP to do the work themselves is fair
I presume the commenter was asking the author of the project to fix a bug. While the submitter may not have actually been said author, it sure seems like a reasonable request.
And yes, perhaps asking the commenter to contribute is also reasonable, but the tone seems unnecessarily adversarial to me.