This 150 will, with co-ordinated use of controls, stall wings level very nicely. This will, of course involve the use of ailerons right up to the stall to keep the wings level.
Even without a lot of roll & yaw control input, it will generally stall and pitch down with the wings fairly level. If the stall is done with some power, and/or there is turbulent air, dropping a wing a little is not unusual. I have found this to be the case with many aircraft I have stalled. Some drop a wing a little (a few a lot!) during a stall, and some control input is needed during the approach to stall to keep wings level, and ball centered.
There is an understood "normal" use of controls, in harmony, and co-ordinated. I do not agree that there comes a point during the approach to stall when controls should no longer used "normally", and skidding becomes appropriate.