I would adjust the tone for the "I am in Arts" section. Saying "I think you have math issues" is not the kind of welcome you want to give to people who do, in fact, have math issues.
I like the end, where you emphasize that math is a great exercise in abstract thinking and modeling. But I would start with something more neutral saying something like, "Many people had suboptimal experiences with math in school because it was often presented well, and some teaching styles don't work for some people. And some may have just always found other things more interesting. However, my goal with this book was to make math more accessible and interesting to many people by presenting material in more a more intuitive manner and emphasizing the core skills of abstract thinking and mathematical modeling of the real world."
That's definitely not perfect, but it's something to start with. Try to imagine that you're someone who never found math all that interesting and always thought that literature or history or art was far more interesting and meaningful, and that possibly you had some bad experiences with math and got the idea that you're not good at it. Now try to imagine what might trigger those bad feelings about math and turn you off to a book, versus what might make you decide to give it a chance. If you don't trust your ability to imagine this way, try to find a close friend who is in this situation and will be honest with you.
I disagree. Looking at the title, & reading over the preview of the book, I think that the concise, anti-politically correct tone the author uses is one of his best selling points. After all the book is titled "no bullshit". And there's already plenty of texts that use ostensibly comforting words to artists.
There is a difference between being somewhat edgy and improper ("no bullshit") and actively working against one's aims by including copy that is confrontational and discouraging to the most insecure segment of one's audience ("you have a math problem; you need therapy"). Those whom it does not bother might appreciate this continuation of his tone, but it is horribly damaging with the audience that it claims to target.
I have some experience encouraging groups who tend to be less sure of their abilities in an academic subject to study that subject and am friends with many people who are much more involved in these efforts, and I know that being confrontational is counterproductive and that you have to be very careful about how you suggest to them that they have a "problem", even if you are telling them that they can overcome that problem. You want to stay positive and show empathy toward their struggles, emphasizing that the struggles are not any failing or inherent shortcoming on their part and are very common.
PS: I know a lot of people who say that they absolutely hate math because they think, for some reason, that they are not good at it. You should consider giving math another try. Math is not just about algebra ...
I like the abrasive comment "you have issues", but it is better to stay positive rather than point fingers. Everyone has issues ;)
I like the end, where you emphasize that math is a great exercise in abstract thinking and modeling. But I would start with something more neutral saying something like, "Many people had suboptimal experiences with math in school because it was often presented well, and some teaching styles don't work for some people. And some may have just always found other things more interesting. However, my goal with this book was to make math more accessible and interesting to many people by presenting material in more a more intuitive manner and emphasizing the core skills of abstract thinking and mathematical modeling of the real world."
That's definitely not perfect, but it's something to start with. Try to imagine that you're someone who never found math all that interesting and always thought that literature or history or art was far more interesting and meaningful, and that possibly you had some bad experiences with math and got the idea that you're not good at it. Now try to imagine what might trigger those bad feelings about math and turn you off to a book, versus what might make you decide to give it a chance. If you don't trust your ability to imagine this way, try to find a close friend who is in this situation and will be honest with you.