I understand you. Although I feel completely the opposite about that.
In my opinion, it’s not chastising. They’ve published the photos publicly on a social network meant for sharing liking and commenting photos. As soon as you publish something it’s free for public scrutiny anywhere on the web, engagement, commenting etc. In my opinion it’s perfectly fine to throw some links into the discussion. This is more of an academic setting than a hate forum so it’s fine imo. Until I see it I can only imagine it and that’s a poor way to judge and have an opinion on someone’s work 
Now about the initial topic. Yes I agree. There are many groups on Facebook with many amateurs in them sharing everything from photos of their unmaintained gardens over cat pics to the most amazing photos on the most amazing locations.
But many of them have a fancy watermark. Imo if the image they shot cannot be used commercially and they put a watermark then they are just one of those people who fall into that category of people who don’t know how little they know so they think they know everything and that their iPhone photo is the best since the invention of the camera. And that’s fine. If they keep pursuing photography they’ll get much better at it and their ego will become much lesser.
On the other hand I’ve deleted my “photography” instagram accounts because some firm took my (watermarked) images and started selling magnets, post cards, lighters etc. Imagine my surprise seeing my shots on those products at my local post office.
I find watermarks or better said signatures in the lower left/right corner of the image to be a great way to establish your name. I’m still not 100% sure if this is good or not but I tend to add a signature on the photos that I print. I was debating with myself should I put a signature digitally on the front and print it like that or just sign it with a marker on the back of the image. So far I’ve put it digitally in the lower right corner and printed it. Just my first name and last name. Nothing special.
Then again to circle back to the amateurs. I have a personal story. My brother (28) found himself with some excess time and watching me do my work he thought it would be a good idea for him to become a YouTuber in his spare time and make big money 
Now his thinking was that he only needed a cheep but fancy camera but he really wanted a fancy intro to his videos. His thinking was if I only made him the coolest intro ever then the entire video would be cool. And that’s the same with watermarks, people think if they put a watermark on their images then they’ll look pro, then they convince themselves that the image is good when they get 10 likes from their family and they are afraid someone will steal it and use it to make money.
Now back to my brother. I told him it’s hard to make YouTube content and that he needs 24h of footage to make just one 5min video. He was not convinced. He thought he’d go around those places that I use as motives for my photos and just have fun, dive, swim at the beach and make a cool lifestyle video.
I gave up on reasoning with him and became a supportive brother. My thinking was, let him buy a camera, let him learn on this mistake and then I could use it anyway 
So the GoPro 9 finally came, he was shooting a few days and figured out he basically shot nothing. And thankfully he was smart enough to say that some shots look cool (slow motion) but that it’s a too hard of a work and he knows nothing about photo/video and has shot nothing even tho he was at my best locations.
And now this would be fine if he was some joe schmoe xD But he is a highly educated navy 1st officer working all over the world So I can totally understand those Facebook people with watermarks.
But the moral of the story is, I was a supportive brother, didn’t even produce the intro, and now I have a GoPro 9 (technically still his but I use it and it gives him hope when he sees cool shots done with that gear 
). So just support those photographers, we’ll be selling our used gear at the highest prices and buying theirs at the lowest (that’s mean, I know)
edit: I’m reading this again and realizing that I melted a lot of unrelated stuff into this post. I guess I was absent on this forum for a while so this is my hi everybody