"Suggesting Jess Phillips ... as opposed to (posh sounding) Rebecca Long-Bailey"
Phillips may not have been born posh, but she's the child of two HENRYs  and she absolutely aspires to poshness. She's best friends with Jacob Rees-Mogg, for God's sake. She's one of those melty types who only joined the Labour Party because the Tories wouldn't have her.
Also she's a massive TERF.
 High Earner, Not Rich Yet. Basically someone who has a six figure salary but feels hard done by because they're not a multi-millionaire.