From the Met's own website
"Verbal abuse, threats or name-calling can be a common and extremely unpleasant experience for minority groups.
Victims of verbal abuse are often unclear whether an offence has been committed or believe there is little they can do. However, there are laws in place to protect you from verbal abuse.
If you’ve been the victim of verbal abuse, talk to the police or one of our partner organisations about what has happened. You’ll find a list of them on our How to report hate crime page.
Even if you don’t know who verbally abused you, the information could still help us to improve how we police the area where the abuse took place."
So you think the police should be able to pick and choose what crimes they investigate?