It seems that Little Snitch 3.4.1 is a rehaul of the old version and this solution to disabling it in the guest account posted here Disable Little Snitch in guest account? doesn't work anymore.
When I get to step 4, there is no at.obdev.LittleSnitch.plist file. Additionally, it seems that when I disable LS in the guest account temporarily and then log out and log back into my regular account, it disables it for my own (admin) account as well. Everything I've tried isn't working and it's so annoying to be bombarded with little snitch prompts on the guest account. Does anyone have a solution?