How to correctly use PatternTest (?)

Question

This works fine:

{3, -5, 2, 7, -6, 3} /. x_ /; x < 0 :> 0
(*{3, 0, 2, 7, 0, 3}*)

and this works fine:

{3, -5, 2, 7, -6, 3} /. _?Negative :> 0
(*{3, 0, 2, 7, 0, 3}*)

I am trying to use something like this:

{3, -5, 2, 7, -6, 3} /. _?(< 0) :> 0

but I am not able to form it correctly.

any idea what is wrong?