Yes you're right OP. As this thread shows though, they'll never admit it even to themselves.
The effect of Brexit on the economy has been enormous - bigger than COVID according to the Brexit-championing government's own figures. Just because other factors are also present doesn't negate that. Comparing the UK to other countries is irrelevant - the proper comparison would be with the UK had brexit not happened. I genuinely don't know whether the people who keep saying "but Germany" are thick enough not to understand that or just lying to themselves.
Pointless, ideologically-driven benefits-blaming thousands-killing debt-increasing early 2010s austerity PLUS GDP-shrinking export-wrecking tax-base-reducing soft-power-destroying labour-shortage-causing Brexit PLUS worst of both worlds economy-ruining death-causing COVID policies PLUS Trussonomics EQUALS where we are now.
Every single one a Tory choice.
Also, even apart from its direct effects, you could say it's all down to Brexit in that the 2016 vote led inexorably to the extremist and criminal Johnson/Truss governments where bowing to the cult is more important than competence.
But it all goes back to 2010 really. Gordon Brown called a bigot a bigot (in private) and the country decided that was worth setting us down this road. Everyone who's voted Brexit and/or Tory for the last decade or so is responsible, and yes we should blame them. I do.