The guy is a jerk. His latest reply to you does nothing to change that. In fact, he even made an obvious lie in his latest response. "Nothing burdens me." Yeah, right. He totally acted like he wasn't burdened by the original email the OP sent him.
I'm just a student myself, but I've interacted with enough professors on a variety of different levels to know that the good professors would never under any circumstances write an email like the original reply he sent you.
A good professor would have written something like this, which would have taken LESS TIME AND EFFORT than the reply he actually composed:
"Thank you for contacting me. I'd be glad to help you decide whether to take this course, but in the interest of making my response as helpful as it could be I kindly ask you to please send me more information about your background, including grades, how long it's been since you graduated, [insert very brief description of other info he wants.]
Best wishes and welcome to the program,
Dr. _____"
If he really didn't even want to answer the question at all, no matter how much information the OP replied (and this appears to be the case), he could have written
"Dear ____,
Thank you for contacting me. My honest opinion is that I cannot offer you any realistic advice on whether you should take the course; I simply do not know you and your background well enough. I apologize and understand this is not the response you were looking for, but I hope you can appreciate that I don't want to take any risk of misleading you and feel it is safer for you that I should refrain from offering specific advice at this time.
[The professor could offer to meet in person in his office at a time convenient for him, or could recommend the OP go see the graduate advisor, or a number of other options here.]
Best wishes and welcome to the program!
Dr. _____"
As it stands, both the OP and the professor would have been better served if the professor had not replied at all.
I would avoid him and his classes at all costs.
If any of you think this is acceptable behavior for a professor towards a student, then I guess you haven't had the honor of being acquainted with some of the wonderful professors who have been my teachers and who would never address a student like this.
Just because some behavior occurs a lot in some sector of life doesn't mean it's justified or acceptable or morally okay. I'm absolutely shocked to find how many people here don't understand this.
Should I one day be in the position of this professor, I hope I remember this thread and avoid his example.