Self-offence, offending yourself is fine.

Offending others, not so.

The OP's proposal is what defines an !-hole. Let's face it, we are not robots. What you just described is human nature. 'Lutang' could also mean he's coping with a personal problem. A feeling of despair or even jubilation is not something that you can just turn off. For as long as he/she is not breaking the law, wag mo na gatungan.