Since Scarlet has the Quick as a Wink one covered, Pink will drag Cobalt over to demonstrate Cloud Nine, telling her to pay attention to her mood and asking him to just hit her with it lightly so she can tell what it does. They can just explain that all she has to do is think hard about lifting someone's mood and the rest should be innate to her. It might be harder if it's a bully, but if their mood is good from the start it might give her an opportunity to show off the person Emi-chan likes and win them around, and give them a chance to learn better about following the crowd and calling people names.

But sometimes they'll just be rude no matter what, so... that's why there's back up powers.