I don't think there is a doubleness here.

If his strong emotion and tears are real ( And they may not be, of course ) the flip side of sentimentality is cruelty for when such powerful emotion as weeps at the drop of a hat, or perhaps of a lady's handkerchief, is sufficiently aroused fury is the result and all the vindictiveness this entails.

how do i know this?

I know myself. but at least, though I cry at movies all the time, I only let my ferocious rages out when alone ( and i do live alone)