Confidentiality ... mis-use by a social worker?

I get a lot of training about this in relation to my work.

Information sharing for safeguarding purposes is very important, but why and how it is shared is also important. 

It should be shared if a person's safety is at risk

It should be shared in a secure manner. If you are sending from an insecure email, that might be a cause for concern, but the social worker should suggest an alternate means of sharing the information. 

It also depends on what your relationship with the individual is. As a professional (teacher, health care provider) etc there are channels you should go through. If you are a family member, you should also have ways to contact them.

You can find the rules on information sharing here: www.gov.uk/.../safeguarding-practitioners-information-sharing-advice 

That is just so bonkers but also typical of uninformed staff.

I've had that response to trying to give information before about a vulnerable person.  They misunderstand what confidentiality means.  They can't tell us anything, we know that and we're not asking them to.  But we are just trying to give information for someone who cannot themselves.  We need no comment about what they do with it even.

I'd try writing a letter.

I DON'T UNDERTSNAD WHAT YOU MEAN CAN YOU TELLL ME WHAT YOU MEAN PLZ

I don’t know what you mean by ‘under confidentiality.’ You’ll need to clarify that.