what was the point of this dialog

I don't like inaccuracies, and I will point out inaccuracies.

A one liner in the song starts getting virally memed.

That one liner have been used in memes even before that song man. It isn't something new that just popped out of because it was in the song.

I can only assume that you don't like Taylor Swift

No, I don't feel anything strongly about her. I don't like inaccuracies.

Because someone else said those words before now people aren't actually quoting Taylor Swift unknowingly.

How do you know they didn't know the phrase before her song?

It is like saying plenty of fish on the sea, who am I unknowingly quoting when I use that phrase?

Of course, it does matter. Why would someone care about your messages, if your messages are filled with inaccuracies? Especially, given your tendency to work those inaccuracies even into technical things.

You can't even say, sorry I didn't know the phrase existed before her song and I will remove that part. And if you did know, well then you are adding inaccuracies on purpose which is way worse.