Okay okay, here is your topic
When talking to Mercutio the first time, for 6 of the 7 clans, not worrying about his state, as you don't know he is a ghoul, should lead to an humanity loss. Letting people injured and kind of dying is quite.. wrong... at least a "are you alright ?" and "you want an ambulance ?" is needed not to lose this humanity point.
Malkavians do not have this dialogue option since Malkavians "know" Mercutio is a ghoul and that worrying is useless (therefore no humanity loss).
Or maybe lead to humanity loss when threatening Mercutio while he is injured could lead to this humanity loss, for the same reasons.
(The threat by female characters to know about Jeanette may not lead to a humanity loss in the Mercutio dialogue)
Either one of the other
