[jwdunne]

I think actively trying to suppress a response to negative or positive feedback will have the opposite effect, just to get that out.

Framing feedback as an opportunity to improve and better yourself/your company, be it toning down something bad or ramping up something good, as opposed to a method for self-validation could help.

You could also look at it from two perspectives. From one perspective, feedback promotes improvement for the good of the company. In this light, negative feedback could be demotivating. The other perspective, preventing your company from declining in quality or regressing, could improve your motivation in the face of negative feedback and perhaps even prevent you from getting complacent with ample amounts of positive feedback.

Since you mentioned meditation, one way to improve at handling negative and positive feedback is to be mindful about it by accepting the feedback for what it is and also accepting your feelings towards it. In fact, meditation can help towards this. This can allow you to take a step back and analyse where to go from here as opposed to extremes of emotion clouding your judgement.

I think it still stings, especially if you invest a lot of yourself into your product. Like anything, it is a skill and it does improve with practice, especially deliberate practice.