Is this a threat?
No: there were Nazis on usenet, pretty sure they were on Twitter as long as there was Twitter.
I see that semi-regularly, having installed NoScript some time ago. Figured I just needed to disable NoScript for the tab in order to see what you were actually posting, and got confused when doing so didn't work. I wondered what else could be causing the "problem", and it wasn't until the proverbial light bulb went off that I thought to check the page source to confirm that I was seeing the post as intended!
I produce documentation at work shared as PDFs. I wrote the style guide as well including words to the effect 'always use decoration, and always scale the image down', after experiencing some end users clicking frantically at the dialog screenshots and going 'dunt work' at me.
403 Forbidden: The server understood the request, but is refusing to fulfill it.