Well, of course thatbags Thailand needs jobs too. But unfortunately we don't have a system whereby countries work together to make a better world for everyone. We have brutal competition, with countries competing with each other to pay the lowest wages in order to extract the highest profits. Given that is the way things are, I don't think the majority of Britons would be so generous as to say "never mind about our jobs - the Thais need them more than we do".
I looked at the EU site to find out what the position is on subsidies. I found it quite confusing since it seems some sorts of payments can be made but there are strict conditions. I expect it works a bit like our tax system where countries do their best to devise schemes that circumvent these restrictions. It seems that agricultural subsidies are an exception because they are provided to all countries so presumably they do not give an unfair advantage to one country over another (but presumably these subsidies provide an unfair advantage to Europe over developing countries).
I am torn about the EU. On the one hand I think it provides a set standard of health and safety and consumer and employment rights across its member countries, which I think is a very good thing. On the other hand, it is difficult enough for people to get their heads around how our own government and local government systems work without adding to that the very complex structure of the EU. The EU has, in my opinion, behaved disgracefully towards Greece - with Germany in particular buying up huge swathes of Greek publicly owned infrastructure as if it were a fire sale. Add to that its inability to recognise that introducing a common currency to countries with very different economies would cause problems, its complete inability to work together to try and deal with the refugee crisis, and the masking - by way of "quantitative easing" - of its financial crisis, and I am losing what little confidence I had in the arrangement.
Sorry, I've gone off the point.