Mauricio Umansky says Lala Kent is a "f***ing liar" for the way she brought up his DM on her podcast. ICYMI ... the "Vanderpump Rules" alum spilled some tea on her " Untraditionally Lala " podcast last week, saying Kyle Richards ' ex slid into her DMs while they were navigating their split. She said Mauricio asked her to grab a coffee because she talks about him on her podcast ... but Lala said she never opened or responded. Shawn Mendes suffered a wicked hand injury ... and whatever he did, it