I don't mind that people rage when they see multiboxers.

The only issue with people hating multiboxers is that it could hurt you if the premades/raid guilds go like "oh that guy, I have seen him multibox, we hate multiboxer, you aren't allowed to join our group!", so it could potentionally be harder to get in premade bgs/raids.

I don't know if you can report people on blizzards servers for being offensive to multiboxers although I assume so (I have only 2-3 boxed on blizzards servers in the past). It is not allowed to do it on PS so fun to write a quote of rules when they do and everyone quickly becomes silent.

Quote from blizzards rules: "You may not use language that could be offensive or vulgar to others.
Hate speech and discriminatory language is inappropriate, as is any obscene or disruptive language. Threatening or harassing another player is always unacceptable, regardless of language used. Violating any of these expectations will result in account restrictions. More serious and repeated violations will result in greater restrictions."