Heechul has always hung around younger female idols to get brownie points from female fans and pretends to care about feminist issues. I say pretending because the crap he said shows that he does not care. Several female SM artists have warned about Suju members and their crappy personalities. Leeteuk literally chased down Krystal from f(x) as a trainee (she was 13, he was 20) saying he was going to marry her. It's not really anything new that a Suju member is a weirdo towards women especially younger women.
He's been under fire for this misogynistic bullshit for years now, it's just now that he's throwing a huge man-child tantrum and exposing his TRUE feelings.
As they say: "Drunk words are sober thoughts"