TLDR: my line manager prefers to give's me a higher workload and smaller deadlines, asks me to coach his new hires but then questions my professionalism in front of the junior team members, shows favoritism for the female colleagues.
Backstory: my previous manager has left the company and a recently hired manager was assigned to our team. I work in IT outsourcing and usually, we had only 5-7% of female workers, it's quite common here. Several people left with the old manager and the new manager approached me and said that we are going to hire more female workers now as our balance doesn't look great and I agreed fully.
So we started the hiring process. The final two candidates were quite different, a male who had proven ~10 years of experience and a young woman with a model look and barely relevant experience. I let the manager do the final decision as he would be mentoring and teaching the new hire. At least I thought so... I'm a senior and I have proven success over the years in this company and great feedback from other people, so when he asked me to coach and to be the mentor for the new hires I agreed.
We were working in an open space and I was happily surprised that the new manager said that we are going to move to a new space so that the other manager's teams from other departments could sit together. There was not a single male. The manager works in another office and when he comes he often organizes dinners and invites his subordinates from other teams as well. At some point I found myself being the only male with him in the company of 15 young women. I think it was one of the first rings that I didn't pay attention to.
Over time I noticed that I was given more and more workload and shorter deadlines. Quite often I found myself being a scapegoat when the team's performance dropped to one of the worst in the company. Our 1-1 usually has bad outcomes and my professionalism and performance are questioned. This had an effect on my raise. Occasionally he shouts at me.
I've already contacted HR and told him about the situation and that I don't wish to work with him but that's a serious accusation so HR asked to leave as is or come with some proof as there is no other team that I can move to. An ex-colleague said to me that this manager has some family problems now and the pieces fit together. I cannot discuss this case with anyone else as he is quite high on the hierarchy ladder. I like this company and I worked here for several years, but this is becoming very toxic. Can I do something about it except leaving?