They have completely blacklisted me.

And even this you can't know for sure with Youtube comments being a flaming pile of shit technologically-wise. Between comments disappearing on expanding, notifications arriving years later, comment history showing different comments depending on the phase of moon and so on and so forth, it's hard to even tell whether you have been shadowbanned in some way or it's another bug. I think after their attempt to merge Youtube comments and G+ and forcing everyone to their stillborn social network, Youtube comments have consistently been the worst commenting platform I have ever seen.

These days I just installed browser extension to hide comments and pretend I don't even remember Youtube ever had them.