The thing that sets off alarm bells in my head for “Tankie but not communist” is someone who uncritically upholds Russia and/or Iran. Take, for instance, one Caleb Maupin. A guy who calls himself a Marxist, but hangs out with noted fascist Alexander Dugin, and was recently outed as a creepy sex pest.
tbh, their funtion isn’t all that objectionable. Mixed use buildings are cool and good, actually. But the fact that they’re made of cardboard and duct tape, look like ass, and are signifiers of gentrification are what suck about them.