She's a snob, she sees a blue-collar guy and probably thinks he left school at 15 and worked with his dad or uncle to carry on the family trade, whereas she obviously had her snotty parents pay for her university (pity they couldn't have paid for a brace for her teeth) to carry on the snotty middle-class snobbery.
She doesn't seem to like anyone but Rodrigo, how many times is she going to tell us that Roddy can do no wrong in her eyes!
Marcus may be just a window fitter, but he is an intellegent and adventurous guy, whereas she is a dimbo who uses big words to make herself look smart!
And Marcus doesn't live with his mum, she lives with him, and so what, he can live with whoever he wants, I did see a wedding ring on Dents finger, her hubby must be blind and deaf!