//They seem to lose their self respect when on holiday//
This chap didn’t seem to have much self-respect last week:
https://www.mirror.co.uk/news/uk-news/man-whips-vest-hot-train-18776275
But having no self-respect is one thing. Having no respect for your fellow travellers, one of whom may shortly be sitting on the very seat his sweaty torso had vacated, is quite another.
//When people blame *the brits* for unsociable behaviour abroad ,would it be more accurate to say English .?//
No it wouldn’t. There are only more English involved in these unsavoury incidents because they outnumber those from other parts of the United Kingdom by about six to one (a fact often overlooked when matters which affect the entire UK are discussed). Proportionately I imagine those from Wales, Scotland and Northern Ireland are just as well represented.
As already mentioned, the problem with “trouble abroad” is that foreign travel has been made affordable to the Great Unwashed. There’s nothing like rationing products by price to make them more exclusive and less prone to (though not entirely immune from) behaviour such as this.