Well, those series of questions are a minefield of traps. First some types of discrimination are illegal. Other types of discrimination are unethical. Further types of discrimination are immoral. And other types of discrimination are counter to stated viewpoints. Finally there are types of discrimation necessary to achieve stated goals. Well, I don't think that any of the cases presented in the movie fit the last description so either they fit in one of the others I mention or they belong to one that I have missed. I have not mentioned types of discrimination necessary to achieve unstated goals, because I believe those are close to unethical or immoral.
As to whether a conservative would want to hang around a position where they were not wanted, that falls in the category of speaking for others. I try to avoid that activity. Speaking for myself, I would sue the [very hot place] out of any employer that attempted any discrimination based upon my non-job related legal activities.
You don’t think it it reasonable to discriminate against a person who undermines the goals and objectives of his employer? Or one whose goals are antithetical to the goals of the employer?