Ignoring boundaries on social media

I'm not to be honest in a particularly good mood presently even though when I got up on Monday morning I did feel fine, having rather more spoons than I did at the end of the week and it has an awful lot to do with a site on Tumblr that I chose not to interact with as I have strict limits about what should be on any tumblr I do.
Let's just start with what are the basic standards for my tumblr which are not untypical of age regressors.
* Safe for work
* NOT 18+ material
* 100% kink free
*  Non sexual
*  No violence,  gore, incest, hentia or child porn
Pretty straightforward don'tcha think?
This is written on a page and in a simplified form is on the actual Tumblr banner so it is clear to anyone wishing to reblog or message me what I want no interaction with.
Okay, a person to whom I do not follow decides to message me channeling his scat (nothing to do with Jazz but everything to with human body waste) play likes in the form of diaper fantasy involving me. Remember at this point I haven't shown the slightest interest in this nor consent to be a part of his kink.
The text is graphic and to me at least frankly disgusting.
I spend time screen shotting the message, getting his URL and screenshotting his banner showing clearly he was NSFW 18+ clearly breaching my interaction limits before submitting to a leading age regression communities blocklist in case he tries this on with others not least those under 18.
While doing this one sees his blog literally contains more of this sh1t, used diapers, people ahem just doing 'it'  so 'stuff it' I think and start the tedious process of reporting to Tumblr the whole effing blog not least as it isn't even flagged up as 'Adult' meaning any minor can come across this filth.
Why oh why is it so many kinksters on Tumblr has absolutely no conception of never mind respect for personal boundaries and being a little doesn't automatically mean either you wear diapers, fill them and especially not engaged in playing with human waste products to the point you'd contact them out of the blue to write  stories featuring them in it?
I sure never asked nor expressed an interest in it.