Please do so.
All 3 countries benefit massively from being in the EU, particularly Poland, who is on track to become one of the largest EU economies.
In fact, every country in the bloc benefits immensely from being in the bloc. The UK is a good reminder that leaving only brings stagnation.
European countries are relatively small in the world stage. Think that Germany has the popularity of Chinese provinces. In trade negotiations the EU gets to play much tougher than any individual country would ever dream of, and free access to the whole bloc is a massive benefit.
Is it perfect? Obviously not. But more often than not, the downsides and inefficiencies come from the fact that individual countries still hold too much power, and have too many redundant bureaucracies with the bloc itself.
So what? That doesn't change the fact that living costs far outpaced gains for a lot of people. They still deserve to be angry and ask for how are you gonna fix their problem.
Cost of living being expensive is due to national government inability to handle housing, infrastructure, etc and so forth. The EU does not dictate housing policy in member states, for example.
If the population is stupid enough to misunderstand the role of the EU and the role of their own national government, and prefers to listen to retarded propaganda that blames the EU for all their woes, then they deserve the hardship that will follow as much as they deserve being angry.