Your background can perhaps have a big impact on how you perceive 'insults'
I always worked in large factories, particually in engineering. 20 years ago it was a competition to see who could use the funniest insult, I dont ever remember anyone getting agitated about it, we had plenty of Scottish, very few Welsh tbf, but every corner of the country was open to ridicule...in a friendly way. Also worked with plenty of ex services, banter was quite normal , taken and given in good humour. A tea break would see maybe 10 engineers sat round a table giving plenty of verbal.
I used to think this was a quite British thing, perhaps it was, perhaps other nationalities do the same, I dont know...but I still can't remember anyone throwing their rattle out the pram in 23 years with one company . No doubt someone did of course, I just dont remember...but overall, you get the picture.
Friendship is no doubt the binding thing. Say something like porridge eater to a Scottish colleague would hardly raise an eyebrow during my time at work but say it to a stranger...and despite many of us being members here for years...we are still strangers...you will unsurprisingly get a completely different reaction.
In simple terms, theres a time and a place.