Sure, it's negative advertising, but that doesn't put it on the level of Lyndon Larouche advertising. It might be on the level of the people who called Microsoft M$ on Slashdot 15 years ago, but I don't really think it is. I didn't see the talk, so I don't know if he called it a swindle during the talk but if he did, then I would put the remark in the latter category.
I'm even less sure what the objection to the other sign is. Is it the word "sins"? They want you to go to their website to see the things that they don't like about Windows 7. Mainly, I would guess, in the way that it restricts your freedom. What is a short word that is less incendiary that means things-I-don't-like-about-a-thing-that-restricts-my-freedom?
Finally, "baby steps"? In this day and age? I've used almost exclusively free software for over ten years. It's really not that hard. I prefer it. So start using free software or don't. I don't care. But don't pretend it's a big hassle that someone told you that you should.
(To be clear, I'm not a total apologist for RMS. He has said some distasteful things about women and from what I hear his hygiene isn't the greatest either.)