Actually this situation with this guy that's harrasing me has been going on for about 2 years, but this situation about others excludimg me from major dojo activities (demonstrations etc.) lasts longer... ever since I joined the dojo about 8 years ago...
.... (you must understand that I'm having second thoughts about about leaving the dojo because I have some good friends there)...
...Wow! ...so this has been going on quite awhile then!
...There must be something positive/good that keeps you coming back that outweighs the negative/bad, you've been putting up with it for 8 years now!
...What is it that keeps you coming back?
...And you mentioned the good friends that you have there, which is something that you want to keep. The social aspect of the dojo is really important to me, almost as much as the training, so I can see where that would be hard to give up!
...I'm sticking by my original opinion, stick with it!!! You deserve to be there as much as anybody else! Don't let the A-holes force you out, don't let them win!!!