I'd thought it was a bit passé (based on the Moscow "no fans" thing 9 years ago, plus the FFP charges).
After Istanbul, I'm all for booing.
‘Why the hell were only CSKA fans allowed in?’ – Kompany blasts Uefa
Vincent Kompany has angrily asked ‘why the hell’ Manchester City fans were not at Tuesday evening’s 2-2 Champions League draw with CSKA Moscow after the Russian club had a large contingent cheering them on despite their stadium ban
www.theguardian.com
After Istanbul, I'm all for booing.