You work long hours because you can't manage your time. That is NOT professionalism. Singing your lungs out in the office. That is NOT professionalism...please ...our ears. Not replying emails after a long long long delay...hell no to professionalism. Slamming doors in a meeting room full of people just because you don't like a certain discussion. That is NOT professionalism. Laughing and joking and distracting everyone when people are trying to listen to someone at the end of the other line...need I say more? And you expect people to be professional to you?
If you want to see what not being professional is, then I will show it. This person probably shouldn't expect anymore willing cooperation from me and can just go ahead and complain because I frankly do not care anymore.