Imagine there is an oversensitive friend who often easily gets upset in some cases that rarely bother other people or hurt someone's feelings amd that it's strarting to be annoying. Once you decide to advise him in a friendly manner and inform him that he'd better not be such a touchy / softy / irritable person.
Someone is backbiting and speaking about your friends character to his audience and you unwantedly overhear his conversation.
Following the related cases above, I would be thankful if you could let me know whether the sentences bellow would work in a natural and idiomatic way. If not, then how shall one indicate such messages:
Don't be such a touchy person / such a softy / such an irritable person.
He is so touchy / softy / irritable.
P.S. I've taken a look on the similar thread here and looked up all the dictionaries and cannot define where and why each word should be used!
The only difference I found between them is that the word "irritable" is a formal one while the other two are not!