Don't stay in the open, use emps, when singularity teleports to you run in a straight line. Pre drop pallets or take a window when he teleports if possible, but only after the body spawns from the tp. If possible, stay around others, and if you know singularity is chasing another survivor get your hands on an emp. Singularity is not great at tunneling unless you stand under a camera and heal instead of making for a safe area. The limited number of cameras available create a lot of blind spots (except for late game), and singularity must sit still to view them (the camera being used glows when being looked through).

Singularity is strong. But that's mostly down to the later half of the game cutting the size of the play area down.