Not only has that response become a silly internet meme for all the right reasons, it's a completely redundant statement that adds absolutely nothing to a discussion. This site doesn't have 'like' or 'upvote' buttons so perhaps users feel the need to '+1' comments with the aforementioned response. There's nothing wrong with wanting to agree with someone and reinforce their post with praise but please do so with additional thoughts of your own that are more likely to encourage more discussion."This."
Moderators already do a pretty good job of cutting that nonsense out but it's one of the top 3 rules of the site and it'd be awesome to see that honoured.
I need to work on adhering to rule 4, personally. Being passionate about something can certainly make that hard at times. However, I'm fully aware of my issue there. I'd hope other users can look at what they struggle with and make an effort to improve on it.