I’m genuinely sorry someone made you feel that way. If they intend to make people feel bad about their own art then they literally have no life 
You’re not overreacting, it’s normal to feel demotivated sometimes. Tbh don’t care about what people will think, just think you’re doing this for your own. However, art critiques also very important to improve yourself.
I’m alright with harsh criticism (since I’ve got that uncountable times💀) but absolutely not with people who claimed to be “very honest” or “harsh” and all they did is just spitting rude words (there is a difference between harsh and rude )
Also don’t stop doing what you love 
every artist is relevant to discuss art. I’m not an advanced artist but still can admire and critique some mistake I see in stunning art (like one time I saw they drew 6 fingers accidentally).
Art is not limited only advanced one because every professional artist is once a beginner and had been on the phase where they questioning their value, they didn’t stop and go through their long journey until they achieved what they want.
Don’t give up, you’re just in your own journey and one day at some point, you will be glad you didn’t stop and happy with your own art. You can talk to me anytime, I’m the president of giving advice but couldn’t make it myself pfffttt 
(wtf this is longer than I expected)