When did we ditch niceness?

Now, I’m sure there’s a fair number of you queuing up to label me an overly sensitive snowflake. Fair enough, but I’m serious here. We, as a society, seem to have lost something. We’ve allowed ‘niceness’ to become a negative trait; something to be purged from our systems in case it shows up as weakness. “Show me a nice person and I’ll show you a pushover” is beginning to feel like the pervasive motto. I realised, standing outside that department store, waiting for in vain for my turn to enter, that I really miss niceness.
Can we have it back please?