funny or me being too sensitive

while i was assessing a patients lung sounds last night, he decides to come at my hand in an attempt to bite me. yikes....he has hepatitis! this patient was not confused or officially mentally ill. i managed to keep my cool ( don't know how) and proceeded to ask him why he tried to bite me knowing that he has a noncurable disease. his reply....i was bored and thought it would be funny. call me crazy but i did not find it funny. tell me....what do you think?