a “helpful” reminder of how bad it is to be a non-native speaker of English

I’m a non-native English speaker working on my PhD at a UK institution. A couple of months ago I was presenting a paper at a conference in the UK. As I was waiting for my turn to present, and trying to forget that I was really nervous, I asked one of my colleagues (a fellow PhD student in my institution) about the previous session. He responded that he had not enjoyed the papers not only because they were not very good, but also because they were both presented by non-native English speakers.