I recently found an article that talked about how young adults nowadays consider slurs to be far more offensive than traditional swear words, so the pendulum has swung from how things used to be in, say, the 1930's where an actor could risk their entire career crashing down by saying the word "bloody" but people would commonly use racial slurs and the like, and they were considered completely okay. I didn't grow up in the 1960's, however, so I wouldn't know much about what was considered taboo and what wasn't at that time.

Here is a link to the article, in case you're curious.

I do know there was no Internet in the 1960's, and since this image sums up Internet commenters in a nutshell, people didn't have to suffer from being bombarded by anonymous entities spouting hateful rubbish in those days. Most people I meet in real life outside of teenagers still show respect and manners, unlike a lot of people online. Not that I'm a saint or anything; I cringe when I remember many things I said and did when I was younger.

OP didn't mention the age of the bragging guys in question. A part of me hopes they were in their late teens. It would be pretty awful if they were fully-grown men.