I've had people critique my products in the past
Same.
IME by far the best way to deal with critique, especially in audio fora, is to acknowledge the critique head-on and explain the design decisions that may have led to the flaw identified. Play it straight, don't make excuses, but offer good explanations. This is something I have experience with, when I was in the speaker game I did most of our interaction with the public.
Speaker design is (correctly) known as a series of trade-offs... if you've actually put work into designing the product, then you can
always spin a narrative as to why you made certain trade-offs,
and come away sounding smart. The other people in the thread will typically admire your honesty and willingness to engage politely with criticism. They may not buy the product, but they will gain respect for the brand, and they might buy your next product.
It sounds simple and easy, but it's actually only simple. Emotions come into play very easily and it takes self-control not to take things personally and speak as such. I have a lot of respect for brands that come to ASR and engage because it's not as easy as it looks.
What you don't see is that from the manufacturer's perspective, it's not just that they have emotions tied up in the product itself, but they also see each good/bad interaction as potentially affecting their income. If you felt that you might get a pay cut every time someone said something bad about a speaker, I am sure you'd find it much harder to stay calm and objective.
Believe it or not, I credit taking art classes in college as helping me with that skill. Each week we'd have an art assignment and then we'd bring them in for the class to critique. At first, it's very hard to sit there and have your work picked apart! For me anyway, the first reaction is to take it personally. You can't do that, you have to beat it out of yourself. But that's what it takes if you're going to respond to reviews.