You would have to have missed both the cabin altitude warning, at 10,000 feet cabin, and the Master Caution that occurred when the PASS OXY overhead indicator illuminated as the masks dropped.
Whether the cabin masks were deployed manually or automatically (at 14,000 feet cabin), the PASS OXY light will illuminate.
There is no other way to deploy the cabin masks...
As far as your question to divert is concerned, for me it would depend on whether the passenger oxygen system is actually pressurized breathing oxy or generated from chemical oxygen generators.
If they were oxy generators, I think I would divert, as a safety concern, as the generators cannot be turned off after initilized, whereas the pressurized oxy can, and be retained for possible use for the remainder of the flight.
This is, of course, the Boeing system.