Sometimes people can find a member's posting style irritating. If they're breaking the forum guidelines, the posts should be reported so the moderators can take care of it. If you just don't like their style of posting, that's what the Ignore feature is for, or you can just choose not to respond to that person's posts. It's as simple as that.

Starting a bickering match never ends well. I have to wonder what forum this artist was on that inspired him to draw this comic: