+1 They wont care.
Most people dont understand, but the majority of Graduate Level courses arnt "more difficult" than Undergrad courses. A lot of them are just undergrad courses with an extra project added to them...These projects, from my experience were: Write a grant proposal, write a lengthy literature review, give a presentation on a random topic or teach a lecture on a topic. Those graduate level courses that people claim to be more difficult are likely so because they focus not on basic concepts like most undergrad courses do, but rather applying concepts to research and what not.
The only thing that really made graduate school more difficult than undergrad, atleast to me, was that there was a lot more required of you in terms of having to teach (which means you have to know what your teaching well enough to not look like an idiot), you have to manage your own studies (which now come second to your research), and you have to do research...and you are expected to produce results from that research..otherwise regardless of how well you do in your classes, you dont graduate.
So, if your just taking a Graduate level course...and not even really taking on the whole graduate level experience, then taking a graduate level course isnt really anything special.