And so did many other races, including the Welsh, too, no doubt.
"Xenophobia" means "a hatred or dislike of foreigners". Therefore, an Englishman cannot be xenophobic to the Welsh, who are part of the same nation state as the English.
As for a "Cymriphobic" Englishman, I'm afraid the Welsh bring it all upon themselves thanks to their arrogant and ignorant attitude towards English visitors. They don't help themselves by speaking English amongst themselves but then suddenly reverting to Welsh when an Englishman wants to speak to them (for no other reason than the fact that the Welsh are spiteful and harvour an extreme inferiority complex towards the Englishm, who are better than them) and for burning down English people's homes and/or daubing them into filthy anti-English racist abuse. The attitude which the average Englishman harbours towards little Taffy is entirely justified in this context. The Welsh show far more racism towards the English than the English do towards the Welsh.