Your friend was wrong. You face the Monsters together. You can not separate them and fight one Monster one way and another Monster another way. So, if a Monster has a strength or weakness (in this case, a strengths that is a resistance to your Items) that affects the combat, then it affects the entire combat.
This FAQ entry covers it:
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Originally Posted by The FAQ
Q. What about during the combat? You said they fight side by side. Does that mean if one monster is affected (positively or negatively) by fire/flame weapons that all of them are?
A. Exactly. A monster's immunity (or weakness) is given to all others in the fight. (This does not include straight combat bonuses or penalties; if one monster gets a -2, that doesn't mean EVERY monster has a cumulative -2 – it's -2 for the monsters taken as a group. And if a monster won't fight, that doesn't mean EVERY monster won't fight, just that one.) If it helps, think of the combat as a combined encounter, and the various immunities or weaknesses as conditions affecting the encounter.
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