In my experience English people are made very welcome in Wales, especially if you make an effort to integrate and learn a little of the language, at least enough to be polite.
Respect the culture and don’t moan about the lack of big city facilities.
Birds make a noise, muck spreading smells, sheep bleat. Accept the obvious, join in as much as possible and you’ll find you are very welcome.
Second home owners are not so welcome in some areas as locals feel that they are being out priced from the housing market and empty homes in winter result in closure of schools, post offices and other facilities. On the other hand others are grateful for the extra money brought in when summer visitors shop in Wales and use local tradespeople for home repairs and renovations. In that respect it’s not about being English but about being part time, just as in any tourist area such as the Lake District, Cornwall, Devon and many others.