Yes, it is, and yes you should feel self conscious about it. When you're in class, you should give the instructor and your fellow classmates the respect of focusing on the class. If you need to take a swallow from your drink or leave to use the restroom, then you do so as quietly and unobtrusively as possible, so as to not distract your instructor and classmates. You should also have your cellphone on silent or preferrably... off. Also, no texting during class... that's rude, too. It distracts you and others around you.
Why was your hair not brushed before class? This isn't even a "normal" rude thing that people do during class. There are many others that I didn't even mention, but brushing your hair didn't exactly make my list... kind of like flossing your teeth doesn't make that list, either.
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