Well Hillary berates Sanders all the time for his healthcare views and resorts to lying about what he says, so yes it's ok. Sanders hasn't attacked her one bit and has remained extremely nice to her, and then she started running those vicious ads. Typical Clinton.
In any event, I wouldn't forgive her. We're in the PC age, don't you remember? We take the names of important people out of universities because they were slave owners, because somehow that's offensive (everyone had a slave back then). Just like we don't forget that our founding fathers supposedly had slaves, we shouldn't forget that Hillary defended a tribal and worked for the campaign. I sincerely hope that black people in America wake up and realize that her interests are NOT theirs, and that Sanders is the man that will help black America and other minority communities.