I do hate that kind of statement, though. If you're going to tell me I'm not relationship material, you might as well just do so rather than saying something nice-sounding that isn't actually true. These kinds of miscommunications are how wars get started. Seriously, it just makes me feel like I'm being talked down to.
I don't feel any better than I would if they said "I don't see it working, sorry."' I feel worse, actually, because I'm a lot more angry. Am I supposed to believe that? We either go on another date or we don't. I don't need my ego boosted. Don't be an ass (and only one person has ever entered that territory) and I'll be fine. You don't need to sugarcoat it, because I can tell that's not real sugar.
Every time a woman says "I'm not interested" without including the F word, I thank them. I find the F-word in these situations to be dishonest and disrespectful.