If you watch BB live, the you will see that Coolios sexism/oafishness etc has been discussed at great length with the general consensus being to ignore him. That's why the other housemates have not 'suffered' as much as Michelle, because they ignore his behaviour. Not everything is shown on the C4 nightly programme.
Almost everyone (esp Tommy and Terry), not just La Toya, have taken Coolio aside and told him what his behaviour is resulting in....ie, feeding Michelles reaction/attention seeking.
Coolios behaviour is analysed by the other housemates just as much as Michelles is, it's just that you don't see it all on the nightly C4 programme. I tend to be an underdog supporter and if I thought for one moment that Michelle was being bullied, I'd be among the first to agree and speak out against it. And, by the way, I'm not a Coolio supporter.
(yes I'm sad and yes I'm addicted)