Storm in a teacup.
737 pressurisation problems are known to happen occasionally. Any airline with a large fleet of these will have experienced this more than once.
Loss of cabin pressure and the use of masks are part of every passenger safety briefing.
This is an event which all crews are specifically trained to handle, they did what was required and the outcome was, as usual, a success.
Just part of life's rich tapestry. Think of it as a wakeup call to passengers to actually pay attention to the safety briefing.