It's 2019 not 1964.
I don't know why you are trying to apply 1964 to 2019. It's a tenuous, "bothsiderist" attempt to paint Democrats as racist by invoking a conversation you had...55 years ago?
How relevant is that conversation to today? Not at all.
Yes, in 1964, the Democratic Party had a lot of racists in it. Fast forward to 2019 and all those people who were racist in the Democratic Party in 1964 now find themselves voting for Trump and supporting Republicans.
This can't be new information for you.
The point is that people who are loyal Democrats can still be racist (especially union guys)--both in 1964 and 2019.