Sorry, but for me, at this point anybody who uses the phrase "regressive left" unironically is lumped in with Gamergators and people who think All Lives Matter.
That says more about you than those who use that phrase.
Its a perfectly appropriate term for those that champion progressive views yet somehow suspend them as soon as Islam is involved. E.g.: http://www.independent.co.uk/student/news/muslim-students-from-goldsmiths-university-s-islamic-society-heckle-and-aggressively-interrupt-a6760306.html
^think about that. A woman gives a talk to address issues such as FGM, apostasy, and radicalisation. Its then disrupted by muslims, and their feminist society 'stands in solidarity with ISOC"