Is Pyromancer getting a perm ban for having Dalamud?

[Folsom]

would mass reporting someone still be acceptable if they were nicer?

Mass reporting someone, so long as they actually broke a rule, is always technically acceptable, regardless of how nice they are. Few companies or other authorities in their right minds write a rule, note that it's only enforced via complaint, and then find legitimate complaints unacceptable, whether enmasse or singularly (though often it takes more than one complaint to trigger a reaction depending on the type of entity the complaint is made to). Whether they actually do anything will be based on their internal policy, but it's extremely unlikely (though not impossible!) that they'll consider the reporting unacceptable or harassment. On the other hand, they may note that it wasn't their intent, but we'll see (or not).