IMO, definitely no. Filtering in general is not spam and its impossible to have a conversation that isn't controlled/filtered. Imagine if there were no standards in your day to day conversation, imagine if you couldn't separate yourself from when those normal standards were thrown out the window by a complete stranger.
The question is about who is doing the blocking and is it for people who *don't* want to see it, or are you trying to stop people who are actively seeking out that information or account from getting it, and why?