This happened to me already in LFR Nighthold.
I got a belt that I wasn't going to wear, but I've been trying to get the transmog since EN, and a guy whispered me for it, didn't like it when I said I wanted it for transmog, whispered me pissed off so I ignored him, then him and his buddies started a vote kick that of course passed because everyone just clicks to kick without knowing the story.
If people are going to beg for gear, have the decency to do it in a whisper and stfu when you're told no.