If the thread was deleted by a mod or flagged in the time between starting a comment and hitting "reply", you'd see a message that "you're not allowed to post a comment here" or similar language. Nothing to do with you, it's the state of the thread you're commenting on.
Hey man, you’re not blocked. Read you loud and clear. Happy Valentine’s Day to you and yours.
In case you're wondering: I'm not blocked in this thread, but I was blocked in a thread about ICE. I told them to thaw out.
If the thread was deleted by a mod or flagged in the time between starting a comment and hitting "reply", you'd see a message that "you're not allowed to post a comment here" or similar language. Nothing to do with you, it's the state of the thread you're commenting on.
Take your tinfoil hat off