You'll see this a lot in online poker. If I had a nickel for every time the river card doubled the number of combos that beat me I'd be able to hire someone else to carry baby figs over the mountain for me.
Some people will never understand poker at its highest level.
But surely when only two hands beat us we have to call cause there are loads which don't? He could just have trip 8's or something or even AK? Such a dumb fold imo.