Well, you believe what you believe, and nobody can fault you for your beliefs, in and of themselves. I happen to disagree with you, but that's not my issue with your comment... my issue is that - regardless of what you intended - your tone came off as very arrogant, dismissive and mean-spirited. And, like it or not, there is a PR aspect to consider anytime someone - who is as visible and well known as you are - says something that sparks controversy.
I think this whole thing has done some damage to the Firefox brand, and that makes me sad, as I've been a Firefox (and before that, Mozilla... going back as far as Mozilla M2, IIRC) supporter for a long time.