This was not /r/roastme/ or /r/roastmystartup/ it was a perfectly normal (for Reddit standards) hobby/niche subreddit and I didn't ask to be roasted, I was offering help as in "hey I built a thing to help you, what do you think? And then I was eviscerated.
It can happen sometimes yes, I've been roasted in a bad on some subs before.
That's really not the majority. What i understood afterwards was: the guys there weren't my target, my product didn't help them at all.
They felt like I'm promoting out of the blue, and i got my ass kicked.