Really terrible feeling while posting product on Reddit

Depends... I posted an idea in "BusinessIdeas" Subreddit and got the first comment which said:
"This will never work. I have no clue how you came up with such a stupid idea." Something along these lines.

In a matter of 1 hour, this comment was downvoted by 30+ people saying its awesome. Really depends how you post, what you post and where you post.

It's not a matter of how big or small your company is. It's a matter of how you are viewed in the reddit community. If you just go on and start self-promoting, you're going to get downvoted and/or removed.

Make sure you add value first. Contribute helpful information to threads. Answer people's questions. Offer help. Be a part of the community.

Then, when you do add something about your product, do it in a non-promotional way. For instance, you could tell a story about what you learned researching an article or building your product or something along those lines. Then offer to post the link if people are interested instead of just posting it. Or, you could ask a question related to the link you're posting, so the link is more supporting reference rather than outright promotion.