I believe the disingenuity is with you. Our laws and especially our human rights laws take a back seat to the European Court of Human Rights. Parliament only rubber stamps the laws which have to be tailored to EU protocols, regulations and legislation. Without the Council of Europe and the EU there would probably never have been such a thing as the Human Rights Acts across the UK such is the EU power.
The UK Supreme Court can be overruled by the European Court but then you knew that didn't you?
You may wish to consider a few things.
The ECHR is not an EU institution. So leaving the EU will not in itself change our relationship with the EU
Generally where UK law is incompatible with the ECHR then a dialogue will suggest ways of making it compatible.
For example, Where the courts disagree, then there have been occasions where the Supreme Court has sent cases back to ECHR for reconsideration - e.g R v Hardcastle. 2009. In a subsequent similar case of Al-Khawaja 2011 the ECHR followed the UK Supreme Court judgement in R v Harcastle.