What should I do if a professor's grading makes me feel bad? I have a professor who grades all his exams by himself (homework, midterm and probably the final). For whatever reason he seems to be a likeable guy during the lecture but he absolutely "wrecks" the homeworks, etc. when he grades.

For example, if you make a little error he will put a huge X across the page or over the entire question. Absolutely massive. And sometimes he will circle a solution or step he does not understand and write ??????????? in red. Finally, this didn't happen to me but happened to a class mate of mine, he wrote "fail" on a question that had some problems with the solution. Now I remember he put "big problem" on one of my answers, taking out all marks, without further comment.

Also he sometimes do not thoroughly read through a question but just marks it wrong, then he changes the marking a few moments later i.e. he will write a huge X over the entire question and put a minus whatever the total points and then scratch out his reading mistake but leaves the huge X there. His marking is also uneven, sometimes he will put -5 for a question and then for whatever reason scratchs it out with a red pen and put -10. 



(picture this, but imagine that the X is over your entire answer)

Honestly, I find that not just homeworks, but also emails. I think he has a way of overreacting to any little thing he doesn't see fit. For example, I asked him a simple question I had regarding some reference I found online which disagreed with his lecture. He said I need to review basic "insert course name here" because everything I said to him is totally wrong. Then I emailed him back telling him that the claim was contained in the link, by another professor. He just replied I should write my emails more clearly next time...what a guy. 

By the way he never clarified that issue I emailed him about, which I think he believes is trivial and only tangetial to the course (he tends to cover only portions of his sum total lectures), but a question is a question even if it is not on the exam, isn't it?

Is his behavior reasonable? It just feels like he is on this power trip whenever he grades stuff. I am scared to approach him because I feel like he marked one of my question wrong after he wrote a huge X and probably discontinued to read my solution which was written on the back of the exam. What should I do?
I would recommend approaching this by thinking about the following question: what is your goal in receiving grades?  

Some things that we commonly do with the grades that we receive are:


Use them as feedback on our strengths and weaknesses in understanding material
Certify our degree of education, thereby obtaining further opportunities
Obtain personal validation from good grades


It sounds to me like you're focusing primarily on the personal validation that you can receive from the professor.  Otherwise, it would be the marks you receive that matter, rather than the size of the X used to mark them.  I would suggest that you instead focus on the more concrete gains that you can obtain from the class, whether intellectual (point #1) or material (point #2).

In that light, the style of markings does not matter, but the precision of his grading does.  When you are concerned that he has not graded you correctly, go to office hours and seek understanding of the reason for a grade.  Perhaps he is being sloppy, or perhaps not---but if you approach him with an entitled attitude such as you are showing in your question here, you are unlikely to obtain the information that you desire.