It's a lot of work, you need good sources (better than reddit comment) and write the text; at least it's more work than just complaining on reddit/twitter. Another matter is that adding sources is complicated (at I found the process cumbersome last time I did it).
I agree that there is definitely a barrier to entry for making wikipedia articles, it definitely takes a little bit of time and effort. What bothers me is in a situation like the person you're replying to described, its hard to feel like the disgust/disappointment with the fact that this person didn't have an article is obviously overstated by the commenters. Yes, making a wikipedia article requires some effort, but not so much that if you cared at all about making one that you couldn't do it in an afternoon or two. Maybe it's an unfair assumption, but it just pushes me to further think that these people who complain about stuff on the internet don't actually care, they just want to win brownie points for appearing to care.
Also such a thread could be an easy springboard for a collective effort on such an article. One could create the article with an outline and share the link in such conversation, so that people could put their time where their mouth is.
