Too many false smiles with no point behind them. It's not as if the both of them can't tell when the other is putting up a front. When tender subjects are being avoided or outright ignored.

Nothing special. Tadashi doesn't have to know particulars to know he's being brushed off. It's not unexpected, of course. When will he learn to just stop asking?

"Are things still... volatile?"

On the bad side of town, that is. Among those disgusting people that Tadashi knows Robert must be associating with in some way in order to continue on while keeping such a low profile.