There are several problems with this question. Firstly, I don't think criticising flaws in a country is the same as regarding it as "the lowest of the low" -- ditto the argument for having stayed in the EU, which was, to my mind at least, about benefitting everybody (the EU will undoubtedly be weaker without us).
Secondly, quite a lot of the migrants *do* apply in other countries, most notably France, Spain, Germany, Italy, and Greece. The UK came behind all of these in 2018, and tied with Greece in 2019.