Rude Employees

Sorry to be venting but I really am getting tired of people not treating each other with respect.

My job requires me to notify folks if they are in arrears on completing a required training course. Due to some software rights and general goofiness when working with a large company accessing the course isn't as easy as one would like. I have tried to make it easy for everyone but when people grow accustomed to a certain 'path' to obtain information, no matter the amount of explanation I give, some still can't figure it out. To be fair, not everyone in the company is familiar with the same jargon and I would be remiss in not admitting that what makes perfect sense to me may not to Joe Blow working in a lab. Nevertheless, why does that make it OK to send me an email like the following?

Hello,
I have tried numerous times to access this link. It does not work.
Don't you know this by now.
I will try again.

This is nothing compared to some of the others I have received in the past. Lucky for this bloke, he works in Austin, TX. I'm getting to the point where I want to drag my pregnant ass over to my fellow employee's office/lab and introduce myself. Let's see how they respond when they have to speak to me face-to-face and not hide behind their email or vmail. I understand why people can get frustrated, I really do. But please approach me with a little respect and drop the hostility. I had another person call me today and start in on why this whole thing is a mess. Due to the fact that my body is no longer my body and I am sleeping for shit I kinda lost it on him. No yelling or anything but I finally said, I am not the programmer of the software and if I had my druthers I would have done it the way you suggest, however that option was not available to me so I had to develop a work around. I apologize if you don't like what I did. He promptly became easier to deal with.

Do they think I'm just doing this to make their life tougher? Seriously. I like taking these types of phone calls and opening email messages that blast me. That's the type of job I look forward to coming to everyday. Use some of that brain to think about how you would like to be approached if you were the individual receiving the complaint before you open your damn mouth.

'K. I'm done.