Yeah there is a difference between speaking white an articulating properly, but is has to do with accent and word choice.
There are some ways of speaking that just turns me off, l have you heard of "upspeak?" Young social media techies use it a lot and I have to work at not shutting down when they start to talk. They also like to start a sentence with "So..."
Yeah, I did not think I sounded like a white person. The person who told me that probably did not like me very much.
Pioneer, I doubt anyone who knows me would describe me as shy. Now I'm not the "life-of-the-party" extrovert, but I'm not shy.