I haven't looked at recent polls but afaik being actively anti EU is very niche, nothing close to 50/50. A lot of exporting businesses are very happy about the free trade opportunities. Annoying rules yes, but at least they're not wildly different in 27 countries. Farmers, despite the protests, generally like the enormous EU subsidies they're getting. As well as the benefit of tariffs that keeps cheap food from other continents out. There are a lot of "socialist policies" than people here simply like.