Who ever considered free graphics design tools bad have no experience with using GIMP. There's nothing you can't do on GIMP. I'm not trying to discredit premium tools but there are so many good free tools which get job done 100%.
Free tools can never been said to be bad. This is because they equally get the job done 100% perfect. For example, Canva and GIMP are free too but they can do any graphics jobs they work on decently.
I wouldn't say that using free tools is bad when it comes to graphics design. I have been known to use both GIMP and the free version of Canva a few times and have never had any issues or complaints after using these.
I believe what is important is your skill and creativity and not whether the tools you used were free or paid.