I am not sure about the usage of freak out - it means wildly irrational behaviour? Can we say for example that when someone is not doing something like expected is freaking out? I will give you an example. I have a colleague who is extremely kind and gentle to me and I am considering this as suspicious , can I say he is freaking me out?
There are two different uses of 'freak out':
Intransitive verb (no object) - to freak out - meaning to suddenly behave oddly, or in an uninhibited fashion, or to get very angry or excited, or worried.
Transitive verb (with object) - to freak someone out - meaning to cause someone else to behave as above.
The verb is considered very informal and conversational and not suitable for formal or academic writing.