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irritieren und durcheinanderbringen

es heißt "ich bringe "wann" und "als" immer durcheinander"
both words translate just fine to the english verb "to confuse", but while "irritieren" means -to confuse or irritate a person like
"Sein Verhalten irritiert -mich-" - his behavior confuses me; durcheinanderbringen is more frequently used in a meaning like -to confuse; -to mix up or -to mistake; just like in the sentence you asked about

however, just for your information there is a specific phrase, where "durcheinanderbringen" ist used in the exact meaning like "irritieren": "jemanden ganz/völlig durcheinanderbringen" like:
"diese Frau bringt mich völlig durcheinander" - this Woman completely confuses me; or "ich bin ganz durcheinander" - i am completely confused
hope this helped

I would explain those words differently, though the above explanation is correct. But it might help you:

durcheinander bringen - to mess up. To mess up your room e.g., to mess up things. On a symbolic level, you can "mess up someone's mind" - that is to confuse someone

irritieren - this is means irritate, to distract someone's attention, to annoy someone.

Du irritierst mich - might mean: you distract me; you annoy me; you (slightly) confuse me (I don't know what to think of you; I expected something different from you)

Du bringst mich durcheinandner - actually also means you confuse me. But whereas irritieren is more a light form of confusing a person, this here means more like "you sweep me of my feet" :)