There is no way, at all, you'll convince the OP that speaking another language socially is acceptable.

We all agree wiping the group is bad...

... but these aren't English servers, they're EU servers, and as a result expect to see multiple spoken languages.

"And as for ''if they were speaking to you, they would speak in the recipients own langauge'' is complete rubbish. I could not even tell you how often ive been spoken to directly in a language i didnt understand. All the while unable to tell them in THEIR language i cannot understand them."

Poor you. Put yourself in their shoes. It works both ways.

"English pls" is rude to people who don't speak English natively.