Yes the TOPIC's drift. He literally responded to someone claiming that free speech shouldn't work for X when X is flat out wrong. While free speech, you are totally right, has nothing to do with Twitter nor with this thread, it does make sense to answer to that question with ''Free speech doesn't work that way''.
Maybe if you don't get this particular example, listen to this. Let's say you walk with a little kid fully naked on the nudist beach. Better explain to him that he should put his pants on like all people do when he's in the real world. He doesn't have to put his pants on right there and then, but it's nice to explain to the little kid that he should put his pants on in the real world.
Same counts for this one. It doesn't have anything to do with this topic, but if you are thinking in such a twisted way about free speech, you should be told that you are absolutely crazy in your head and that there is no way of ever landing a decent job.