I would understand session beer to be in the 3.5% to 4% abv bracket, table beer should be under 3%, preferably closer to 2%.
Have to confess I do have a bit of a taste for the strong stuff - a good 6.5% DIPA, for example. The problem with strong beers is the alcohol needs to be balanced by the hop and malt flavours. Too many of the current hipster brews are a car crash, strong for the sake of it with no balance at all. Often with ridiculous over-sweet additional flavours.
Anything 8% and upwards is just silly.