Its very difficult to become a good teacher or coach if you dislike people. A good coach genuinely cares for the development and well being of his or her students, and the people in the community. I treat all of my students as if I were their brother and sister. If you have a general distaste for people, I suggest looking into a different field. I truly believe in the maxim of Judo and as it applies to everything. "Maximum Efficiency, Minimum Effort and Mutual Welfare. To be a contributing member of society you have care about society and it's progress.
"I just hate stupid people" is a cop out. Stupid people are just people who haven't been properly educated , as a teacher it’s our job to give to those people, and educate them. If you did your job as a teacher, those "stupid" people will pay it forward and educate others as well.
Jiu Jitsu doesn't lie, if your not a genuine person that has a interst in helping people it will shine through, your mask of false sincerity will be exposed, be true to yourself and others at all times.