The work world is more diverse than ever and yes, many have used unethical means to gain and retain their positions. Honestly, from the advice given to me, I've learned not to play into the banter. Bullies will likely get bored and move onto something else. A. indicating they are not preforming to the level they need to be if they have all this time to bother others and B. they were hired on and are accepted in this role. Now at this point your best interest might be with another company. But don't give up too quickly. Best to stay in good relationship with those who can help you and in time some of your questions may be answered.

Personally, I think micro-agression is a relatable subject and should be able to be handled gracefully by HR with mediating tools.