As a poker player, this is definitely a scandal. I think the thing non-poker players forget when watching hands like this is that the players cannot see each other's cards like we can. So from Lew's perspective, her hand is astoundingly weak. It doesn't matter if you think your opponent is also weak. You would have to know that you're beating them in order to call their river all-in, which was substantial.
The board shows TT93A, with Garret holding 87 and Lew holding J4. The number of hands that Lew is beating when she calls the river is small (15, not counting for combinations with different suits). The number of hands that Garret is likely to have that she is also beating is essentially just 2 hands (87 of clubs and 87 of hearts), as all other hands would likely have folded pre-flop, or folded to her raise on the turn.
Garrett could play this hand identically with AA, Ax of clubs, Ax of hearts, TT, T9, T3, 99, 33, AT, JQ of clubs, J8 of clubs, JQ of hearts, J8 of hearts, which I count as 29 hands, not including offsuit combos that made a full house or quads. Lew would know, not necessarily to the exact number, but that there were a lot of hands she's losing to, even a bunch that Garret might bluff with here.