I am old too and was taught the same thing.I'm also a grumpy old fart and yes, reactions to success on the field have changed forever. My generation was told never to show someone up,
Here's a quote from Dusty Baker that illustrates how things used to be and especially with Bob Gibson:
"Hank Aaron told me: 'Don’t dig in against Bob Gibson, he’ll knock you down. He’d knock down his own grandmother if she dared to challenge him. Don’t stare at him, don’t smile at him, don’t talk to him. He doesn’t like it. If you happen to hit a home run, don’t run too slow, don’t run too fast. If you happen to want to celebrate, get in the tunnel first. And if he hits you, don’t charge the mound, because he’s a Gold Glove boxer.’ I’m like, ‘Damn, what about my 17-game hitting streak?' That was the night it ended.”
Here is a link to some more quotes about Gibson. I like the "It's nice to meet you, Mrs. Baker":
https://mopupduty.com/bob-gibson-stories-and-anecdotes-040714/
However, after having a kid play rec, club, travel and high school sports, my eyes have been opened. Just as Dusty explained the culture back when Gibson was playing, these young people have taken control of it for their generation. They celebrate things we would consider routine and that is fine. Its their sports now and they, not us old heads, shape how the game is played and how participants act. In the end, if it makes playing a sport more fun, I am all for it.
One interesting thing to note - and I could be off on this - is that the crap talking that goes on appears to peak in HS. It starts in middle school and then gets more pronounced early in the HS sports experience (those handshake likes may feature more "eff-yous" than "good games"). As kids realize how hard it is to actually play at the varsity level and beyond, it seems like they have a newfound respect for their competitors.
So while the guys at that level, college and the professional level still celebrate, they typically seem to do so in what is, for their cohort, a respectful manner. They know how hard it is to get there, whether its winning a spot on your school's varsity roster, getting to play in college or even breathing the extremely rarified air of being a professional.