I believe this is the other way around: I think Mion disliked Ooishi because of the fact he sealed Mion and the Sonozaki in the image of "bad Yakuza", and his obnoxious obsession about the Hinamizawa incidents.
However, Ooishi proved in Minagoroshi-hen that he knows how to stick on his work or not.
Furthermore, that nickname was more like a joke or humourous note about her roll skill, which definitely gives Mion the confirmation that Ooishi isn't a blockhead as he was supposed to be.
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