"Some people told me a ryzen 5 1600 is bad for 144hz"
Depends on what you are trying to play and what your graphics card is. Your graphics card determines your max FPS and your CPU determines your average frame rate. A Ryzen 5 paired with a 1070 GTX will anywhere from 70 to 120 FPS depending on which AAA games you are playing. If you are playing League or CSGO, you are already going to be over 200FPS anyways. If you invested in a stronger CPU such as a 8600k (which is significantly better for gaming than any Ryzen CPU by the way), your average framerates would go up by 10-20 but your peaks would stay relatively the same. No way does a Ryzen 5 bottleneck a GTX 1070.
Getting solidly over 144FPS consistently for AAA gaming requires a...