Emsiwemsi: Unfortunately this is a common practice within the politically correct police service of nowadays. Any 'hate' crime, no matter how silly, will recieve a priority response, in some cases, even over serious incidents. I would of hoped the police service would have learnt from the tragic events recently revealed in Leicestershire with regard to dealling with reports of threatening and abusive gangs of yobs.
The IPCC will probably refer your complaint back to the force to deal with (dont expect much).
Did you take your youngest to the station?.