Re. flags. I discussed this with my mixed race children, and said it was a real shame that the St George or Union flag can't be exhibited without some people associating it with racism. No other flag of the UK gets that response.
[EDIT - I also explained to my children why people are currently upset in the UK. As soon as anyone mentions safety issues from undocumented men entering the country, they're shut down as racist. That's not fair and creates a bigger divide. Discussion and listening is the key to understanding views. Name calling and instant labels creates discord]
I grew up in the 80s when the NF used the flag as its symbol. It hurt, and it scared me. However, it's my national flag and what a shame it would be if this bothered me now. What a victory to those racists trying to empower a symbol that doesn't belong to only them.
So, I have discussed racism with my children. I have told them of my personal experiences. They are aware because they're often questioned - politely - as to their heritage (they have olive skin). (That's not racism in my opinion, that's curiosity)
Education is power as they say. I've never installed fear into my children about racism, but discussed why people can act that way, and to be prepared and respond accordingly. Don't treat aggression with aggression. Educate if the situation demands it. Be prepared to walk away. Be ready to report. Stand together against racism.
It is a part of their make up, but not the only definition of their self.
I haven’t read any post other than the OP, so my post is my own experience and not based on any other posters experiences.