I have read most of wilkipedias bio on Prof X, (wow is it long). In it he has stepped down,died,bickered with members,started other academies, placed in prison, but never so unceremoniously forced out as depected in this film!
A short scene where he by choice and the good of the academy,resigned would have been great. But that was not put in. Leaving the viewer to the assumption that he was forced out, which in my view would have been a wrong.
Having collected X-men comics for just over 40 years, whilst I don’t claim to have an encyclopaedic knowledge, I can attest to the fact that Charlie boy has done some very questionable things in his time and, depending on the writer, can come across as a bit of a dick.
If you find yourself with time on your hands, have a read and you’ll see what I mean.
I think what the OP is saying is that do you think Prof X actions in THIS movie merit his being kicked out and named changed on the academy he founded?
I agree with the OP that his kicking out is not just. If he resigned that would be OK, but it seemed like he was forced out.